A Tidal/Deezer Streamer to augment Oppo 105?

Maybe try Quboz?
Supposed to be really good for jazz and classical.

But I have an iPad that can handle anything. Plus a Macbook. I still play CD's - their sound is better than anything save my vinyl set-up and the FLAC files but, again, the Oppo won't do Deezer.

You could rip all CD into harddrive. Oppo can connect to a music server and play all kind of music files. Tidal HiFi is very good for streaming 44.1k/16bit files, added MQA. Your 105 won't decode MQA, but your PC/Mac will do MQA 1st unfold 96k/24bit or 88k/24bit. Oppo 105 takes these and you get a wonderful dac & streamer.

Just look at Deezer, isn’t it streaming at MP3 filesa t 320kbit/sec?  then No
The Tidal is far superior than Deezer. It streams lossless at 44.1K/16bit and lossy 192k/24bit.
You might try Qobus if you liken native 96k/24bit.
If you have Tidal, you could sell off all CDs unless the album you like to keep for life.

Actually, Deezer DOES stream at lossless FLAC.