Microsoft's WSL2 GUI integration works based on Wayland (and XWayland): https://github.com/microsoft/wslg

Rather than going fully protocol-based (like Waypipe), they used Weston to render to RDP. Using RDP's "remote apps" functionality, practically any platform can render the windows. I think it's a pretty clever solution, one perhaps even better than plain X11 forwarding (which breaks all kinds of things like GPU acceleration).

I don't know if anyone has messed with this enough to get it to work like plain old RemoteApps for macOS/BSD/Windows/Linux, but the technology itself is clearly ready for it.