over years i started to use vnc instead of X as it works better over WAN. Super simple setup. On linux host one just runs an in-memory Xvnc server. The session

over years i started to use vnc instead of X as it works better over WAN. Super simple setup. On linux host one just runs an in-memory Xvnc server. The session and running applications are all stay there no matter whether client connects or not. The client runs on any platform.