I usually fail at pi-related installations, but managed to get this working on my first try. Major kudos for these instructions! I do have one question however...

I have splashscreens for everything in my Retropie setup. It's the splashscreens from this post:
https://retropie.org.uk/forum/topic/4611/runcommand-system-splashscreens

Has anybody found a way to change this initial screen:
P_20210614_191615.jpg

Into something like this:
launching.png