I see a couple of problems with this:
There are no "moderates". There are conservatives, leftists, and also uninformed and thus somewhat confused conservatives and leftists. We need to explain conservatism to everyone with the confident expectation that most Americans are conservatives.
The media will absolutely excoriate our ticket no matter who is on it.
Yes, I agree. My preference is for an all conservative ticket. I certainly don't want a social liberal like Rudy as our VP choice.