SUMMARY kdeconnect's remote input system is depending on kwin-wayland. That's why it isn't compatible with anything other than kwin. Most of the rest of kdeconnect isn't depending on a plasma-session in any way. Thats why it would be nice to have a implementation which isn't depending on kwin. That could be done with ydotool. STEPS TO REPRODUCE 1. install kde-connect 2. connect a device 3. Try out remote-input in a non kwin wayland session. OBSERVED RESULT remote-input isn't working. EXPECTED RESULT remote-input should work or at least there should be a error message.
I've found a relevant ticket on kdeconnect's own bug-tracker: https://invent.kde.org/network/kdeconnect-kde/-/issues/4
> kdeconnect's remote input system is depending on kwin-wayland. That's why it isn't compatible with anything other than kwin That is not the case (any more). KDE Connect uses the RemoteDesktop portal, so it works on any system that implements the portal. Most notably xdg-desktop-portal-wlr does not implement it currently (https://github.com/emersion/xdg-desktop-portal-wlr/issues/2), but that's up to them to add support for it.