Why not bring in Clemson and Georgia Tech? It would strengthen the SEC media footprint in the entire states of South Carolina and Georgia. It would also allow for these long time rivalries between the four Georgia and South Carolina heavies to have SEC importance. The addition of Georgia Tech would also provide an increased overall academic profile for the SEC. Recruiting-wise it may even cut down on the poaching of recruits in these states by the schools from competing Power 5 conferences.
The two divisions could be as follows:
East
Tennessee
Vanderbilt
Georgia Tech
Georgia
South Carolina
Clemson
Florida
Kentucky
West
Alabama
Auburn
Miss St
Ole Miss
LSU
Texas A&M
Mizzou
Arkansas
Let the teams play each other once in their own Division and allow for two games per team for cross-divisional play for a total of 9 games per team in SEC play. Each school will have a designated permanent cross-divisional rival such as:
Tenn-Bama, UGA-Auburn,Vandy-Ole miss, UK-Arky, GT-Miss St, Clemson-TAMU, Uf-LSU, and South Carolina-Mizzou.
In the sense of fairness and parity, the second cross divisional games would be determined by individual schools W-L records the previous year: Ones versus ones, two vs twos, etc.. This year, for example, Florida would be playing Alabama, Tennessee would be pitted versus Auburn, Georgia would go against LSU and so on. As far as east vs west in this scenario Florida would have to play LSU and Bama, TN would have Bama and Auburn, Georgia would have Auburn and LSU. The top 3 teams from each division would have a tough path no matter who they played.