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Do they still make the Sandisk Clip and Sandisk Go? Years since I used one, but from memory don't they do what you need?
Bit late as a reply, but I remembered your post when I came across this fully open source MP3 player. It does not even appear to have BT, so might be an option.
As that might be relevant, I came across it from this youtube video here (got it in my feed, haven't watched it yet).
Edit: nevermind, has wifi and bt after all. Not surprising as it's ESP32 based, so it's literally just there.
I'd suggest looking at small embedded computers and hats for them to fit your objective.
Since you're familiar with Linux, I'm thinking an Arduino might work out. There's probably a better way but I'm imagining you configuring it to work like a USB drive and dropping in playlist files along with your music and using the hat to select your preferred playlist like a homemade iPod.
You'll want to avoid the generic junk mp3 players online since there's no way to be certain it's free of radio chips before detailed inspections. Since that stuff is typically pumped out with whatever junk was available that day.
Check for some cheap Ali express mp3s
Look on fiio.com. At least in the past they made some no-wireless ones. 128gb wasn't really a thing in the mp3-only era though. Cowon D2 is a great player but uses SDHC (32gb max) rather than SDXC. I don't remember if it has FM.
For some fucking reason, the few FIIO models that are non-wireless have a microphone. Recording capability Is also a big no for a SCIF IIRC.
I'd like to use my existing 3.5mm headphones. Also doesn't support FLAC and has tiny capacity.
Follow up question, why do you need music?