Marc Summers was considered at one point to host a LMAD revival that didn't happen, but I think he'd be a good choice, especially if Harvey could be the announcer/sidekick. :-)
I'd also say Tom Bergeron, but he seems content with Dancing with the Stars and AFV.
I think LMAD should be an hourlong show, and I think Monty should occasionally host segments as he did on the most recent LMAD, providing he doesn't unintentionally show how inferior the current host is in comparison.
Todd Newton might also work.