VRF , Management access only and default gateway

Hello
I am preparing (3) new devices to become my new WAN. The topology looks like,
                 ASR1002x - Has management int and dg for remote access.
                                     Also has DG to WAN ISP via BGP
                 3750x stack - Has management int and dg for remote access.  (ip vrf management 0.0.0.0 0.0.0.0 (Management vlan hsrp ip))
                                       Also has DG to ASR hsrp - which causes the Management access to drop.
                 ASA5545x - Has management int and dg for remote access.
                                      Also has DG to ASR hsrp - which causes the Management access to drop.
I MUST KEEP THESE NEW DEVICES OFF THE PRODUCTION NETWORK TO AVOID ANY POSSIBLE ROUTING ISSUES.
I have implemented unique EIGRP instances between the new devices.
These new devices have a management interface so I can access them remotely. I configured the default gateway pointing to the HSRP of the management Vlan and I have remote access.
Obviously I cannot have (2) default gateways out different interfaces, without assigning one with higher admin.
What should my management default gateway look like so I can have remote access to the device and still have the WAN/LAN routing work as needed??

found another thread with some suggestions, maybe it helps at the moment.
 http://forums.lenovo.com/lnv/board/message?board.i​d=Special_Interest_Utilities&thread.id=6000

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