Wouldn't you basicly need perm rivals from each pod then for rotating pod schedules? Making 9 conf games a year (3 pod, 4 other pod, 2 other rivals)
If you didn't have rivals in each pod, then there would be 2 year spans where you would only have 7 conf games compared to other teams having 8.
This is how I would work it. In the Great Plains pod, K-State would play KU, OU and OSU every year. We'd also have one permanent rival from the Texas pod, one permanent rival from the Southeast pod, and one permanent rival from the other pod. We would also have one rotating opponent from each of the other three pods. With that system, you'd go through one complete schedule rotation every six years.
Years 1 and 2
Great Plains: KU, OU, OSU
Texas: UT (perm), TCU (rotate)
SE: Clem (Perm), GT (rotate)
Other: ISU (Perm), WVU (rotate)
Years 3 and 4
Great Plains: KU, OU, OSU
Texas: UT (Perm), TT (rotate)
SE: Clem (Perm), FSU (rotate)
Other: ISU (Perm), Lville (rotate)
Years 5 and 6
Great Plains: KU, OU, OSU
Texas: UT (Perm), Bay (rotate)
SE: Clem (Perm), Miami (Rotate)
Other: ISU (Perm), ND (rotate)
I also like Pan's idea of realigning the pods every few years. Based on the above, I would probably realign the pods every six years. Years 1-6, the Great Plains and Texas pods are in the same division. Years 7-12, the Great Plains is paired with the Southeast pod. Then years 13-18, the Great Plains is paired with the Ohio Valley pod (or whatever it's called).