Take whichever of those three teams last appeared in the CCG out of contention. Then take the other 2 teams and take whoever won head to head. Go on to the next level of tiebreakers should 2 of the teams not have made the CCG--but this scenario would only happen right now if those teams were Baylor/Tech or ku/ISU since every other team has been to at least one CCG. This allows it to be settled on the field.
Under this scenario, blow u would be eliminated because they represented the south last year. Tech would get the nod because they beat texas.
There is some precedent for this kind of tiebreaker. The big televen has had a scenario that if there is a tie, the team representing the conference in the Rose Bowl is the one who hasn't been there the longest time. When Iowa went with Brad Banks in '02(?), that's how they got in IIRC.