I'm probably the guy, i had many problems with the 7.4.X Ren'Py and asked for alternative builds of the games in many discords. Tom (Ren'Py creator) changed how Ren'Py render works in 7.5.X/8.0, now it works like a charm. The latest JoiPlay uses Ren'Py 7.5.X/8.0 (and forces the games to use it too). I really think its worth a try.