Roy Kramer had nothing to do with getting it right or getting it wrong. He was just using a rule that was never intended to be used for 1A. It was in place in order for conferences in lower divisions to have a CG. The rule is still in place and what you are proposing is not allowed.
"Under current rules, FBS conferences must have at least 12 members, and championship games must be between the winners of two divisions within the conference. Each division must play a round-robin schedule during the regular season in order to hold a championship game.
.......................................................................................................................................................................................................................................................................................................................................................................................................
Conferences that want to play championship games must either play their championship game between division winners after round-robin competition in each division
or between the top two teams in the conference standings following full round-robin, regular-season competition between all members of the conference."
College football: FBS conferences with fewer than 12 members now able to hold championship game