Navidrome suggests using jukebox mode to play music directly to the server’s audio hardware. It uses mpv. You only need a client which supports jukebox mode. Currently Ultrasonic and dSub seem to support this feature.

Alternative:

Look into Enigma2 set-top-boxes which support this and more features for free. (or are open source)

They tend to vary on price depending on which type of tuner you would use.

Quite easy to setup more extensions like for streaming channels, movies or series.