Indiana
Minnesota
Nebraska
Northwestern
Ohio St
Rutgers
Pitt
Duke
Alabama
Memphis
UNLV
EDITED to remove teams with full schedules, even if they have that date open
And Duke-Northwestern haven't announced their matchup date yet, but both have 2 September open. (Same story with the unscheduled Duke-Pitt game, but that's in-conference so likely later). So it looks like it's Pitt, Alabama, Memphis, UNLV or some team nobody has heard of.
Any of those teams (besides maybe Memphis and definitely UNLV) wouldn't likely be a home game though. Could maybe pull a neutral field one? So question is would you rather match up with one of those? Or against an Idaho St type opponent?