So like you, Music does play an important part in my household as well. I lament the demise of the iTunes/Music plugin, but don't look back, don't look down. Not to disagree with your assessment of the Airfoil Plugin, but I've been using it to populate an Indigo Page with Song Title, Artist, and Album. There is some basic Previous / Next Track as well as Play/Pause as well.
One of my biggest issues with the iTunes plugin was it didn't seem to know if iTunes was actually playing or not. I had a few Action Groups for when I left the house to stop iTunes, but of course, just like a single button both opens and closes the garage door, a single button both starts and stops iTunes . If it was actually playing, it would stop.... but if it were stopped, it would play. Not what I needed/wanted to happen. I think I ended up Force Quitting the iTunes/Music app in the Action Group(which was on a remote computer as well), but it was always a pain that the plugin just didn't know.
The iTunes Local Control seems to be working just fine, but unfortunately for me, my Music Mac is NOT my Indigo Mac, so that plugin isn't as useful for me as it might be. (but as I'm writing this, just thought maybe "sharing" my libraries might be an option)
I've also become so disenchanted with the Music App in general, as Apple's relentless push to subscribe to everything the Music app is a pale comparison to what iTunes was back in the day. There is another music app that I play with occasionally called Swinsian, which is much like iTunes was in its prime before Apple made it almost impossible to use. But writing a plug-in for the app is way beyond my pay grade.....