A simpler solution maybe,
Turning On
You could use a smart timer power plug to turn on both the PI and the Projector,
In the projector,
Setup > Power Options >Auto Power On > Select the input for the pi
Turning Off,
FPP Pi > Use shutdown script in lead out of your show. (This will shut down...
You can try renaming the sequence filenames and mp3 filenames, and readd them manually to a playlist, and should work in theory,
A pain, but will get you running.
The patch.0 parts in the filename look weird,
I suspect the patch.0 is the name given during upload and is meant to be changed to the proper name afterwoods,
I would delete them from the playlist, and delete the files if theyre in the file manager and re-render and try uploading again,
(also...
can you build/connnect them to a seperate power supply/receiver.
That way you could use a smart wifi power switch to turn them on and off at set times or via your phone,
Is it a particular sequence or all,
Have you run check sequence?
Check effects with shaders,
Save a second copy and remove all shaders and see if crashes,
Iv done a different sequence for wiggles that may also help if you like,
https://auschristmaslighting.com/threads/xlights-sharing-sequences.10708/post-123579
It was my first ever sequence done from scratch so be kind :P