Hi
Regarding the last item on your list:
Access to commercial streaming services (Spotify, iTunes, Amazon Music, YouTube Music, etc). <-- Note: unlikely to happen due to licensing restrictions
Have you checked if it's possible to get access to Qobuz? Just asking since I know apps like "Audirvana" has this option, and they are a smaller company so they might be more on-board with things like this. Just asking 🙂