Xlibre

I think in other cases with Wayland the compositors just support RDP or VNC output, VNC being slow but simple and RDP working well over WAN links with various acceleration options available in the protocol (maybe including just encoding as a video stream, same as any modern WebRTC video conferencing and desktop sharing system) if the server takes advantage of them, degrading to something like VNC if not. I think Waypipe is more for the single-app forwarding use case (although I believe RDP protocol is capable of single-app forwarding), and I'd be super happy when it gets integrated directly into Portable OpenSSH or as a Linux-distro maintained extension for the popular platforms.