I could see Rove and crew defecting to Huckabee maybe (I don't think Huckabee would want to run), but some of the GOP won't risk supporting a third party that's going to knock them down to third party status, even for one election.
It really depends on who runs as the neo-con candidate, Huckabee would be really good for them but he's not as much of a fiscal conservative as they'd like. They'd need someone like Rubio or McDonnell to really harpoon Paul, but they wouldn't do it either.
The best they could get are Michelle Bachmann, Duncan Hunter, or maybe Haley Barbour.