I'm pretty sure there's a rule that you have to be in the conference to play in the conferences Bowl game unless its a lower bowl and the conference doesn't have enough eligible teams... But hey it could end up being a smart play by the Big12. ND isn't ever going to be good enough to play in that game anyways. ND still thinks they are high and mighty and if we inflate their heads even more with this chance at the Champions Bowl and we get more money out of it, why the hell not.
Every single one of the bowls is free to do what they want. Every Big East Bowl had an or Notre Dame option in the tie in.
There are no 'rules' for who Bowls can pick other than the contract they have with the conference.
IF ND isn't coming as a full member, **** em.