My suggestion, based on Tene's, is that each elite is in the same lvl range as in game (e.g. 50-59) but also have the specific type.
I then think the champion should have no restrictions at all. That way they can use their winning team. If they had a lvl cap then anyone could come, beat them and it wouldn't prove anything about who's the strongest. It'd also make champion fights not very interesting.