Okay. Advice, hail mary edition:
If you have a Cisco layer3 switch at that location with the APs, you can configure an ip helper-address to point to the ip address of the controller on the ip interface:
config t
interface vlan 11
ip helper-address <ip address of Aruba Controller>
In addition, you would also have to configure the switch to forward port 8200:
config t
ip forward-protocol udp 8200
Good luck... :(