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20 hours agoBit 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.
… yet