Working on updating qmk for my Sat75x and hacked a new more portable fix for the oled not working on latest qmk.
https://github.com/MelissaAutumn/qmk_firmware/commit/fe84cf7c6051423d9a54ca09704d6b69e80627f6
It's not perfect, but it works enough for me. It seems like the display needs a reset or something for display on and off commands. Oh well.