> I don't think the application can work on Wayland because it can't inject commands. Screen sharing is a possibility, but that's it: injecting key strokes or mouse input into applications can only be done by even worse hacks.

This app probably should use libinput to emulate keyboard/mouse instead of tapping into X11. No need for crazy hacks as libinput supports Wayland. Applications that provide remote desktop-like functionality like Sunshine used it and runs well on Wayland.