A lot to think about, but hey this is music we're talking about
Might be able to just plug the USB drive to my TV and if it supports playlists (eg, grateful Dead 1973-05-20), with optical out to the receiver, it might work... the UI would be the TV.
If I can mount USB drive to an Amazon Fire tablet, depending on the outputs, this might work too.
Definitely tired of my Yamaha receiver though; really don't need the 7.1 stuff!
Thanks for the advice...