If you do any of these mods successfully please let us know. I personally do not need the bluetooth functionality but can easily see how it would be useful! That said why not just read directly from the Walnut's DAC?
Glad to have both of you here and sounds like there are a lot of people who were hyped up about the Chinese music!
(Which is really dang good, by the way.)
Just wanted to show that on one of my three Walnut microSD's, I have started keeping all albums converted from FLAC to a single WAV image. If you have a WAV+CUE file just copy the WAV over. Obvious downside is you can't pick what track from an album you want to hear, but I listen to full albums start to finish 95% of the time, and I was realizing all my skipping was just passing by full albums until the next one. So this works very well for me and I can get back to the start in just 15 clicks forward or back.
And here are my foobar settings for converting WAVs to one large file and removing all metadata, if it helps anybody.