How much $$ do bells and whistles add to preamp?

Just buy what you want. It's easier to find lack of features rather than  any uneeded attributes. 

Belles Aria Signature pre fits your desires (it does have bypass, but simply do not use it). Straight forward pre that is only 2 channel analog w/a MM phono included, and that is where David put all his emphasis, as usual.

I would give the Musical Fidelity Ms8 preamp a hard long look.

I’ve heard great things about Belles, possibly look into Don Sachs,Aric Audio, Space Tech Laboratory, and I’m sure there are many more smaller builders that make some wonderful gear without many of the features you don’t need.  I was in the same boat.  I have no need for tape loops, HT bypass.  In my world, remote wasn’t even something I needed to have. 

Belles Audio Aria Signature preamp would be perfect.  Talk to John Rutan at Audio Connection.