15 of the 18 schools in the Big 12 could play the entire ACC + Notre Dame each season.
Our schedule most years could be 9 conference games, Iowa, an ACC school, and a cupcake.
Thinking more about this. It seems like a good way to get creative about making more TV money.
An 18-team Big 12 and the ACC plus Notre Dame would all keep the same weekend in October or November open. Years in advance, they would announce pools like this.
Big 12 home teams: Washington, BYU, Arizona, Iowa State, K-State, Texas Tech, Houston, West Virginia
Big 12 away teams: Oregon, Utah, ASU, Kansas, Oklahoma State, TCU, Cincinnati
Big 12 sitting this one out: Colorado, Baylor, UCF
ACC home teams: Florida State, Georgia Tech, Clemson, UNC, Wake Forest, Virginia Tech, Pitt
ACC away teams: Miami, Notre Dame, NC State, Duke, UVA, Louisville, Syracuse, Boston College
Then like 3 weeks in advance of the Saturday they kept open, they would announce pairings for games. The TV networks and leagues would work together to make them quality games based on how the teams were performing that season.
The Big 12 schools sitting it out would know in advance that it's their bye week and would schedule accordingly. The home/away would be known well in advance, just not the opponent.