Mizzouri & Wagner?
Those were your alternatives...
And if you state neither Idaho St or Wagner then consider all the number of P5's that lately have had 1 FCS game. I get that is going to change for SOS measures for the CFP but if P5 teams (including Alabama, etc) who only need to schedule 3-4 games a year were still playing FCS teams every year then why wouldn't it be acceptable for BYU when they have to schedule 12 a year and are still relatively new to independence...
Ideally they'd obviously like to get away from that as well but schedules have drastically improved since the start of independence and they will continue to improve...