Kristin Chenoweth? No?
I love her, but absolutely not. She does not have the right voice. Nor the constant E's that are to be BELTED. A la LuPone and Lady Paige.
And Idina could not do Eva. Not for long, anyway. This score is miles harder than Wicked's, or Wild Party's, or Rent's. It's not just two or three belty numbers, but half the score is Eva singing, and singing high.
And of course, I am concerned about Idina's acting. Eva is an actor's role, and it would be a egregious decision to not cast an actor/singer in the role.
And her voice is a little thin for my tastes. I like my Eva's big and full voiced.
Personally, I think I have too much bloom.