Hello,
I don't think that what you are trying to do is impossible but I don't think it is going to be easy.
If I remember correctly the default "roles" of the MSM760 controller's port are built around the concept of one being LAN facing and one being WAN facing.
Things like the teaming only (again IIRC) run over the LAN port so you will struggle to turn the WAN port into a HA version of the LAN config.
Given that you already have the controllers in a team is it not enough to run 2 controllers off one switch and one off the other so that you always have a controller available should a switch fail?
I assume that your switches are redundant at layer 2 and layer 3?
Do your Virtual service communities on the Access Points tunnel traffic back to the controllers or are they egressing traffic locally on their connected vlans on their switch uplink multi-vlan trunks?
Hope that gives you some pointers.
thanks
Ian