Despite her inexperience, I think Mulroney would be unbeatable.
https://www.linkedin.com/in/carolinelapham/?trk=public-profile-join-pageShe's the same age her dad was when he became PM and arguably more experienced. I think he was a mining company president.
Ford, on the other hand, would make sense if they liked being in opposition and want to stay there. Maybe he could get some help from Russian hackers to make it competitive though.
Ford has learned the FordTrump magic of telling poor slobs that he is one of them and getting people who have never looked at a ballot in their lives to get excited. Of course, f*** him. But he could win.