I think the top four are UTSA, Memphis, Tulane from the American and Texas State from the Sun Belt
How many more MW schools do you ask for?
UNLV seems next on the list, but I think that depends on how many yeses they get from Texas schools and how large they want to go as a conference.
Air Force, Hawaii football, New Mexico, Utah State, Wyoming, SJSU and Nevada all have reasons they aren't in already.
Maybe you consider a couple other American schools like North Texas, Rice, or South Florida, but those all seem like they have as many issues as remaining MW schools.
Maybe you go shopping at the FCS level and pull North Dakota State, but are they really going to be better than Wyoming or Air Force?
A couple other to call if desperate:
Arkansas State (Sun Belt)
UTEP, New Mexico State, Sam Houston or maybe Liberty (CUSA)