We don't need to go to extremes for home games.
FCS? Sure whatever, but no one cares. Easy win/motivator, in theory.
SEC school? Sure whatever, but it's not happening.
How about a happy medium?
SMU is ok, but I would prefer a low tier P5 over a low tier G5.
Iowa State? Colorado? Indiana? A 1 and 1 seems reasonable (I know we've done that w Indiana, so it can be done). Now that sounds more like an opportunity game. And it's many opportunities over several years, not the same team over and over again that only has marginal interest in one market (that's SMU if I lost you).
We always remember the time we beat Baylor at home, even though our record is now 1-12. We always remember the time we almost beat Kansas State. No one gives a crap when we beat, uh, all those FCS teams.