Solo streamer

I guess there’s no simple unit that is only a streamer without bells and whistles that I don’t want or need.

Lindemann Limetree Bridge II

PS Audio Airlens! Sounds terrific with a Direct stream DAC.

Why not use the Cambridge with a stand alone DAC?   If you like the Cambridge user interface and are looking to improve sound quality , that's where I would start.  

You may want to consider the iFi streamer. It is an excellent and very inexpensive streamer that punches way above its very low price point.