This sounds like an ideal application for a Lectrosonics DM1624 (or one of it’s brothers).  A “router” uses a “matrix” to do the routing.  By using the presets on the DM1624, the wireless mike(s) can be “routed” to any room or combination of rooms at the push of a single button.  Likewise, the rooms can be combined in any combination with the wireless mikes assigned as needed.  The DM1624 has 24 presets which should be able to handle any combinations that you can think of.  Also, you can change the routing in real-time for something not covered by the 24 presets and then cancel the changes the next time a preset is activated.

A DM1624 has 16 inputs and 24 outputs.  Enough for most situations.  If more are needed, they can be ganged to increase the inputs/outputs and the presets can be carried from one to the other.

bob