I appreciate that the fit will be less than ideal. I'm mostly scrambling since my current beater's frame just cracked, and the market for steamrollers is pretty liquid. So, I'm hoping this will do for now while I wait for a better size.
I'd suggest 60 or 58 to, personally i'd size down my surly's from now on, i'm only 5'7'' and i'm itching for a 49cm roller, my 52cm CC still feels kinda big
The standover height is the least important part about bicycle fit, it was invented by an American because they don't like straddling the top tube.