"Hotel" wi-fi sharing single connection with multiple devices

Hi,
Been reading lots of stuff on here over the last few days and bought 2 airport expresses the other day but I can't seem to get them working quite how I need:
Ok, hotel wi-fi charges per connection - the wi-fi is unsecured (no key, yikes, no encryption) but is secured by a username and password that you buy. I have no problem with that but they quote costs are per device (per MAC address I assume) so cost is steep for my laptop, iPhone and ipad!
So, my first airport express will "join a wi-fi network" I guess in bridge mode (no choice - correct?) and allow Ethernet clients and then provide Ethernet out of LAN port into WAN port of 2nd new express. The 2nd will "create a wifi network" with NAT and DHCP on a 10.0.1.x range with the airport 2 taking 10.0.1.1 IP address. This bit works fine and all my devices can connect and get allocated a nice hidden 10.0.1.100+ IP address as per my dhcp range I set.
I tested this setup at home and had to set airport express 2 to ignore double NAT but it works - however, on my test wi-fi network that all this connects to just as a test, I could see 2 IP addresses allocated :(. One to the first "bridge" and one to the router (the 2nd airport express).
How do I do the above without consuming 2 ip addresses and thus 2 mac addresses on the host wi-fi network? Is it possible? A friend says he has this working with a cheap router running dd-wrt but I have bought the 2 airports now!
Thanks.

How do I do the above without consuming 2 ip addresses
Sorry, not possible. Remember, you have 2 AirPorts. Both need an IP address.

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