My solution...

Replace WKU with Missouri State. Put Missouri State in the East (at least for time being). This does two things. We get our 12th member for football, but with Missouri State in the East if gives us balanced divisions in basketball. We would have UALR, UTA, Louisiana, ASU, ULM, and Texas State in the West and USA, Georgia State, Georgia Southern, Appalachian State, Missouri State, and Troy in the East. For football we'd replace UALR and UTA with Idaho and NMSU. If Idaho were to leave, add JMU to the East and send Missouri State to the West. Since Arkansas State would have a big interest in Missouri State, they could be cross division rivals. Louisiana could go East in Missouri State's place, but that is their call.