actually I do, I was thinking that we take the competition format and we take the master and apprentice(it's not how they said in DXD but whatever) thingy and mix them together.
so it's like a magician will start from lower tier of magician, the pawn but later on they can promote into a higher tier once they know their path (well pawn promote to any chess piece except the king) and later on they can choose either be a Paladin, King, Tactician or Lord (if you reached this level, you'll have to leave your current master and create a new group)
so how this work is that each group will be participate in the competition (which happen once in 3 months) while this being said, they can prepare and use any facility at the school, where they suppose to compete at. Any battle outside the competition are prohibited, injuring or any destruction will cause direct disqualification.
(sorta like that I guess and sorry for the late reply!)