This is kind of down the path I was thinking. The library will be pretty static once I finish ripping FLAC files and eliminating duplicates.
The Pi arrangement with WiFiBerry is proving very good results as a transport, I’d like to move the data management away from it. Seems like I’d like to index the library on a laptop, have the interface there, then use some back-end connection to tell MPC on the Pi to “play this now”. I’m not married to Volumio for this, but respect the fact that people are working on it and it looks and works well for more modest libraries.