Clara just screams "Pwetty pwetty pwincess!" at me, so I think it clashes terribly in those combos. I know you're going for contrast, but it's like pink and lacy + crackly and harsh. It's a bit funny.
I really love
Jane Ernestine and
Martha Thomasina.
I want to smush
Marie in front of all of them, but I think it rhymes a bit.
I made a list of masculine NNs for feminine names for a friend of mine, and ended up falling head-over-heels for
Jamesina recently. :-P