Update: I removed the old superheavy box and moved two of the teams into the regular "heavy" category, while the others joined the stunty teams in unranked.

New rules suggestion:
A player can state before a match is agreed that he wants to play with his off rank team, regardless of who's turn it is to choose. If it's a stunty team, he chooses the opponents team as well using the normal rules in terms of games played, but he gets to select from all the categories.

However, if the team is not a stunty, the opponent still gets to choose as normal - again without being restricted to a single box.

Ph:

Goblin[P]
Halfling[P]
Khemri[P]
Chaos Dwarf[P]