Recommendations for Blu-ray Player

Google shows NO hits for AmazonUHD app except for this post. No clue what you're talking about.
And why would you want a quality audio streaming service on a video player?
Nobody else does so you'll have to build a one off.
Easier and cheaper to get a streamer.

I would simply get a Roku or Amazon Fire Stick and keep your Sony for discs. A smarter and much less expensive alternative, and tons of streaming options available to you, including Tidal. Heck, most smart TV’s can steam what you want to via apps.

@fuzztone AmazonUHD = Amazon Prime Music Ultra High Definition it's kind of like Tidal Masters or whatever other HD streaming services are out there.

@bkeske think those devices have HDMI out only. For audio, I need it to be coax - the HDMI will connect to a TV for watching music videos (concerts, etc.) Also, I only have one coax input to bring in all the audio, so all content needs to be on one coax output, rules out the TV option.