Commonly, I have adjacent bathrooms. I would like to install a steamer between both bathrooms or under a showerseat and I am looking for a valve to direct steam to shower head A or shower head B. I am looking for a valve that has a control on it to blend in with other residential bathroom fixtures.
The steam generator manufacturers have duplicate on / off temp controls that can turn on a steam generator remotely and shut it off when a temp is reached. So , all you need is a valve to direct steam to either destination.

Advice and options greatly appreciated.

The steam does NOT go to the shower head it goes to a "nozzle" in the wall near the floor so the steam condensate can drain out of the pipe into the shower area. Steam rises so the steam out of the shower head would rise to the ceiling and NEVER reach you.

Although it would be in the position to fill the steam in the entire room, but would take much more efforts, energy and would not be that effective. Apart from working issues, it will also spoil your nozzles (which are usually silicon).