No and no, as far as I know he has no history of switch hitting and this would be the wrong place to take a test drive. He needs all his natural instincts to have any success.
If he's desperate, he might... Don't see him start out southpole, but maybe he will when things are going south (pun intended).
I don't expect him to at all. I think he knows it would be stupid to try that against Wlad... or does he?
Haye has **** footwork and balance in his natural stance, going southpaw will only mess him up more and lead to him getting KO'd even faster.