If the AAC were to add (back) Boise State and San Diego State, then that would be a decent landing spot for BYU.

• WEST Division: BYU, Boise State, San Diego State, Houston, SMU, Tulsa, Navy
• EAST Division: UCF, USF, Cincinnati, Temple, ECU, Tulane, Memphis

* Navy seems to prefer the private schools and games in Texas and has a fan base in San Diego County...but, you could switch Memphis and Navy...

Sample BYU schedules: 

2025

• Home: Stanford, Minnesota, Temple, Houston, Tulsa, Virginia, San Diego State
• Road: Hawaii, Utah State, Memphis, SMU, Navy, Boise State

2026

• Home: Arizona, Utah State, Cincinnati, SMU, Navy, Boise State
• Road: Utah, Virginia Tech, Tulane, Houston, Tulsa, San Diego State

2027

• Home: Utah, TBD, UCF, Houston, Tulsa, San Diego State
• Road: Arizona, Utah State, ECU, SMU, Navy, Boise State

Those are some pretty fine schedules.