You should just be able to move the IAPs to a different subnet. You might have to change the Virtual Controller IP Address when you do, however to match the subnet. Besides that, the IAPs will come up and if they get their addresses via DHCP, they will simply find the ip address of Airwave (which is hardcoded) and report where they are. Again, you will have to change the Virtual IP Address so that things like Dynamic Radius Proxy work properly.