I'm not a fan of McDonald in midfield but it may be a case of needs must and it was proven to work at Ibrox. Yes he had a nightmare by all accounts at Tynecastle but he's much sharper now than he was then.
If lasley was available, I'd be replacing Grimshaw with Cadden who is comfortable on the right. With Lasley missing though, more restructuring is required which may lead to both wingers playing. Their two fullbacks are rotten at defending.