The configuration is valid but after a reboot I don’t see an entity for the switch. I know that there are some problems and issues with the remote GPIO control but I’m at a loss as to why I’m not even seeing an entity appear.
So just as an update to this. I ended up just using a command line switch that SSHs into the other Pi and triggers a script that hits the momentary switch. Eventually I’ll combine the scripts and write something that checks if it’s on or off. Right now if I trigger the On script twice it will actually turn it off.