Wireless light/fan switch reccomendations

I have a light/fan combo in a bathroom that are controlled with a single switch. I want to control them separately, but running a new wire would require ripping out drywall, which I don't want to do. It is in a guest room, so it can't be controlled with an app, even though I know there are ways to give guest access to certain home automation systems.

The power runs up from the floor, through the switch, and then up to the fan, so I have power at both locations. The wiring for the fan is in the attic, so putting something up there is easy.

What I imagine exists is a remote double relay that can be controlled by 2 physical switches(preferably single gang, but I am prepared to open up the wall a bit to install a double gang box). I would prefer that the relay be powered by 120v, rather than a 12v device that needs a plug somewhere, but its not a total deal breaker.

Anyone have any ideas?