Thanks for this write up! I was looking for something to replace volumio/hifiberryos and mopidy with Iris is a great combo. I couldn't get the subsonic plugin working too well (the plugin seems a big half baked and the maintainer doesn't used anymore), but the local plugin works fine over smb.
Ive been using ivy on my Chromecast it's good, but Flauncher looks more like what I want.
Protip for Chromecast users - disable the stock launcher via adb to set a new default
Hey I got one too! I took it apart and repainted it black to match.
For temp schedules I made a local calendar in HA with repeating events with a description of "high" "mid" and "low". The automation trigger is a calender event that reads the description and sets the temp accordingly
Probably a smart move after the Yuzu stuff