From what I understand, the barrier devs are planning to add Wayland support via libei [1]. I guess this should be relevant to you too?
1. https://lists.freedesktop.org/archives/wayland-devel/2023-Ma...
1. https://lists.freedesktop.org/archives/wayland-devel/2023-Ma...
It also doesn't help with window management: "One example is xdotool which does window focus and modifier mangling (see below). Window focus notification is not available to a pure libei client and would have to be obtained or handled on a separate channel, e.g. X or Wayland. Having said that, a Wayland client does not usually have acess to query or modifiy the window focus."
Edit: libei supports a "receiver" mode too. Perhaps it'll be useful after all!