Note that Input Leap will be supported on a Wayland session in GNOME 45 / Fedora 39 thanks to the new InputCapture portal and Peter Hutterer’s libei work.
Barrier seems to be dead upstream and Synergy is closed source though, so those 2 probably won’t get updated soon
Have you filed a bug somewhere in the issue tracker? I don’t think anyone from the GNOME devs is using a surface, so if you don’t provide any info, there’s a good chance they don’t even know about it.