Guest Access with Inter-vlan Mobility

I have a setup as follows
Two datacenters each with one wlc5500, one guest access server and one internet circuit with firewall.
LWAPs connect to the data centres over a WAN.
Each LWAP has two SSIDs one guest with web auth and one private with 802.1x.
Site1 has 40 APs and site2 has 10 APs.
The best scenario would be to have 30 APs on each controller but this means that there would be a mix of APs centrally switched on different VLANs for the guest wlan.
Is there any way to anchor clients that intially associate to WLC1 so that if they roam on to WLC2 they keep the same IP address from datacentre 1. Similarly those that associate to WLC2 keep their IP from datacentre 2 if they roam to WLC1. Finally if either WLC1 or WLC2 fail then all clients re-associate to the active WLC at one DC. All the config guides so far only depict one internet circuit so I can't work out if this is possible yet. So far with both WLCs active the client changes address as they roam to the other WLC.
I would like to avoid creating a L2 link beween DCs if possible

Thanks for looking
(Cisco Controller) >show wlan 3
WLAN Identifier.................................. 3
Profile Name..................................... guest
Network Name (SSID).............................. GUEST
Status........................................... Enabled
MAC Filtering.................................... Disabled
Broadcast SSID................................... Enabled
AAA Policy Override.............................. Disabled
Network Admission Control
NAC-State...................................... Disabled
Quarantine VLAN................................ 0
Number of Active Clients......................... 0
Exclusionlist Timeout............................ 60 seconds
Session Timeout.................................. 1800 seconds
CHD per WLAN..................................... Enabled
Webauth DHCP exclusion........................... Disabled
Interface........................................ guest-vlan
WLAN ACL......................................... unconfigured
DHCP Server...................................... 10.18.227.10
DHCP Address Assignment Required................. Enabled
--More-- or (q)uit
Quality of Service............................... Silver (best effort)
Scan Defer Priority.............................. 4,5,6
Scan Defer Time.................................. 100 milliseconds
WMM.............................................. Allowed
Media Stream Multicast-direct.................... Disabled
CCX - AironetIe Support.......................... Enabled
CCX - Gratuitous ProbeResponse (GPR)............. Disabled
CCX - Diagnostics Channel Capability............. Disabled
Dot11-Phone Mode (7920).......................... Disabled
Wired Protocol................................... None
IPv6 Support..................................... Disabled
Passive Client Feature........................... Disabled
Peer-to-Peer Blocking Action..................... Disabled
Radio Policy..................................... 802.11b and 802.11g only
DTIM period for 802.11a radio.................... 1
DTIM period for 802.11b radio.................... 1
Radius Servers
Authentication................................ Global Servers
Accounting.................................... Global Servers
Dynamic Interface............................. Disabled
Local EAP Authentication......................... Disabled
Security
--More-- or (q)uit
802.11 Authentication:........................ Open System
Static WEP Keys............................... Disabled
802.1X........................................ Disabled
Wi-Fi Protected Access (WPA/WPA2)............. Disabled
CKIP ......................................... Disabled
Web Based Authentication...................... Enabled
ACL............................................. Unconfigured
Web Authentication server precedence:
1............................................... local
2............................................... radius
3............................................... ldap
Web-Passthrough............................... Disabled
Conditional Web Redirect...................... Disabled
Splash-Page Web Redirect...................... Disabled
Auto Anchor................................... Disabled
H-REAP Local Switching........................ Disabled
H-REAP Learn IP Address....................... Enabled
Client MFP.................................... Optional but inactive (WPA2 not configured)
Tkip MIC Countermeasure Hold-down Timer....... 60
Call Snooping.................................... Disabled
Roamed Call Re-Anchor Policy..................... Disabled
Band Select...................................... Disabled
Load Balancing................................... Disabled
--More-- or (q)uit
Mobility Anchor List
WLAN ID IP Address Status
(Cisco Controller) >?
(Cisco Controller) >show wln 3
Incorrect usage. Use the '?' or key to list commands.
(Cisco Controller) >
(Cisco Controller) >
(Cisco Controller) >
(Cisco Controller) >show wlan 3
WLAN Identifier.................................. 3
Profile Name..................................... guest
Network Name (SSID).............................. GUEST
Status........................................... Enabled
MAC Filtering.................................... Disabled
Broadcast SSID................................... Enabled
AAA Policy Override.............................. Disabled
Network Admission Control
NAC-State...................................... Disabled
Quarantine VLAN................................ 0
Number of Active Clients......................... 1
Exclusionlist Timeout............................ 60 seconds
Session Timeout.................................. 1800 seconds
CHD per WLAN..................................... Enabled
Webauth DHCP exclusion........................... Disabled
Interface........................................ guest-vlan
WLAN ACL......................................... unconfigured
DHCP Server...................................... 10.253.128.10
DHCP Address Assignment Required................. Enabled
--More-- or (q)uit
Quality of Service............................... Silver (best effort)
Scan Defer Priority.............................. 4,5,6
Scan Defer Time.................................. 100 milliseconds
WMM.............................................. Allowed
Media Stream Multicast-direct.................... Disabled
CCX - AironetIe Support.......................... Enabled
CCX - Gratuitous ProbeResponse (GPR)............. Disabled
CCX - Diagnostics Channel Capability............. Disabled
Dot11-Phone Mode (7920).......................... Disabled
Wired Protocol................................... None
IPv6 Support..................................... Disabled
Passive Client Feature........................... Disabled
Peer-to-Peer Blocking Action..................... Disabled
Radio Policy..................................... 802.11b and 802.11g only
DTIM period for 802.11a radio.................... 1
DTIM period for 802.11b radio.................... 1
Radius Servers
Authentication................................ Global Servers
Accounting.................................... Global Servers
Dynamic Interface............................. Disabled
Local EAP Authentication......................... Disabled
Security
--More-- or (q)uit
802.11 Authentication:........................ Open System
Static WEP Keys............................... Disabled
802.1X........................................ Disabled
Wi-Fi Protected Access (WPA/WPA2)............. Disabled
CKIP ......................................... Disabled
Web Based Authentication...................... Enabled
ACL............................................. Unconfigured
Web Authentication server precedence:
1............................................... local
2............................................... radius
3............................................... ldap
Web-Passthrough............................... Disabled
Conditional Web Redirect...................... Disabled
Splash-Page Web Redirect...................... Disabled
Auto Anchor................................... Disabled
H-REAP Local Switching........................ Disabled
H-REAP Learn IP Address....................... Enabled
Client MFP.................................... Optional but inactive (WPA2 not configured)
Tkip MIC Countermeasure Hold-down Timer....... 60
Call Snooping.................................... Disabled
Roamed Call Re-Anchor Policy..................... Disabled
Band Select...................................... Disabled
Load Balancing................................... Disabled
--More-- or (q)uit
Mobility Anchor List
WLAN ID IP Address Status
(Cisco Controller) >?

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    *pemReceiveTask: Jan 28 23:05:02.364: 00:1e:c2:c0:96:05 Skip Foreign / Export Foreign Client IP 0.0.0.0 plumbing in FP SCB
    *DHCP Socket Task: Jan 28 23:05:03.869: 00:1e:c2:c0:96:05 DHCP received op BOOTREQUEST (1) (len 308,vlan 84, port 13, encap 0xec03)
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      IPv4 ACL ID = 255, IPv6 ACL ID
    *DHCP Socket Task: Jan 28 23:05:03.887: 00:1e:c2:c0:96:05 10.130.98.8 RUN (20) Fast Path rule (contd...) 802.1P = 0, DSCP = 0, TokenID = 15206  Local Bridging Vlan = 84, Local Bridging intf id = 0
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