Hell, why not just have a 14-team playoff put all the SEC teams in it automatically? You could structure it a bit differently, maybe divide them up into two groups where every team plays every other team in their group, and then the top team in each group play each other for the championship. Maybe intersperse a few exhibition games against I-AA teams and a few bye weeks.
And since all SEC all the time might get a little boring, after the championship game, they could have some kind of exhibition game against the best of the non-SEC teams.