Since I had few spare time and some friends asked me how I fixed steam’s proton-ge issues with flatpak, I made a quick and simple script to ease/speedup the process. It require you to use batocera v32 beta to work properly, v31 have no sound in flatpak’s apps due to alsa use by the way (v32 use PipeWire).
Script HERE
Just extract in /userdata/ folder and run Steam_Flatpak.sh. As always, use it at your own risk !!
If you do not trust it, simply fix issues yourself :)
Tested on 4 batocera v32 installations, success each time.