I am not sure, when you say Aruba doesn't support Multi-Tenant, what do you mean by that?
Aruba does support Multi-zone, where, as it says:
"The MultiZone feature allows organizations to have multiple and separate secure networks while using the same access point. It also allows AP to terminate to multiple managed devices that reside in different zones. A zone is a collection of managed devices under a single administration domain. The zone can have a single managed device or a cluster setup."
I had a similar case when someone from the sales team told us that Aruba does not support WiFi Offload according to 3GPP, however we managed to win the project implement it and it is still working according to 3GPP specs. There are always different types of "namings" and "features" which are called diferently, but with a slight work-around you have it working properplly as the standard or feature requires.
You also have a thread here on Airheads which even shows how to configure Multi-zone.
https://community.arubanetworks.com/t5/Wireless-Access/How-to-Configure-Multizone/td-p/481727