I don't know what you mean you'll need to break it again, this one particular hole is already plugged in Wayland. That won't cause additional breakage, and you'll still want to be plugging those additional holes like ptrace anyway.

Input injection is being worked on in a different library, that brings a standard API that's supposed to work the same across Wayland, X11, and with sandboxed contexts: https://gitlab.freedesktop.org/libinput/libei