Great write up, thanks for sharing. I run some of the services mentioned, but got some good ideas from the article and the comments.

One suggestion in place of MPD is lyron (https://lyrion.org/). I’ve used MPD for years but recently switched to lyrion and for me, it’s a lot easier and suitable when you have many clients. It’s nice to have a single (nice) UX/UI for my music and all the “speakers” on the local network.