It needs to be made so that you have to win your conference. Every conference plays the same number of conference games, or give weight to the conferences that play more conference games (playing more non-con P5 teams would work also). This would force ND to join a conference. IF, there is a champ that shouldn't get in, i.e. Washington this year, they are left out. If there is more than one undeserving team, then the next best team gets in. What constitutes undeserving would need to be ironed out.