you don't need to ask permission to play someone's theremin. what are they gonna do, yell at you for not touching it?

Severance

I can definitely see an LA-3A working for ya.

That extra colour and compression will save you loads of time in the mix.

I like watching women's sport climbing for........uhhhhh.....yeah.....uhhh....the politics.

Definitely not......hmmmpppft......girls with big arms

reverb.com/item/4067964...

It might also be worth getting a cloud lifter to use with your dynamic mics, so you are able to push the volume of the mic into the pre amp and hear more of the character. Especially for the whispering performance

The brighter neve 1073 could work but it wouldn't be my first choice, and I'd stay away from an API style pre (rounder) or a 610b (darker) sound. If I were engineering your vocals I'd want a preamp that would really emphasize those upper harmonics without sounding too Pop.

For your vocal style, I'd really recommend getting an "harder" sounding pre like a ln SSL channel strip or a Neve 5316.