Play Utah and Utah State most years in the OOC and play Boise State, SDSU, Houston and SMU every year in the AAC.
So, the annual schedule includes:
Utah
Utah State
Boise State
San Diego State
Houston
SMU
The other 6 games include two other marquee P5 opponents and 4 out of: UCF, Cincinnati, Memphis, Navy, Tulsa, Tulane, Temple, South Florida and ECU.
That lineup is likely to give BYU at least 3 or 4 ranked opponents each year, 3+ rivalry games (I think BYU would develop some new AAC rivals) and frequent road games in California and Texas and occasional road games in every other region of the country.