Robben maybe. Messi can shoot with his right foot when needed, and also lfor a eft footed player learn to play with his right foot is very difficult wich is not the case for right footed player. You can not find any left footed player who can play with his right foot as good as his natural one. But the other way around is more common.
i don't think so... had a injured right foot, so i trained with my left and now i am comfortable to cross and shoot with it... i think if he tried he could learn it in half a year...