So, I can then use Audirvana as the source for the music.
Did you ever try using the Audirvana remote app to control your collection and/or Qobuz/Tidal music? You should try.
If the BL28 and your Mac mini or Laptop are on the same network, you are able to stream directly to the BL28 (just a case of right the settings, maybe some trail and error, but the BL28 must be set as output)