About the 2 way switch support: I can’t find the wiring diagram but I suppose it is possible to wire the second switch to the secondary switch input of the first, and have a setting in there somewhere to get the right behavior. But it would require quite different wiring than the “normal” hotel switch setup, so it is not an inplace replacement for dumb switches and it may require adding extra wires.
I would go for the automation way, and use the second switch without any actual load if it is allowed to do so.
It won’t. The usual wifi graphs are created using a wifi radio, which cannot interpret all the other types of communication happening on the same frequency.