Partner with a school like CSU with smaller exit fees than AAC schools and pitch to the Big 12 that they'll pay half or more or said school's exit fees so that both schools can start in 2017?
Now - BYU and CSU as a pair dominate the availability category, and can be seen as a no-brainer package deal per cost and geography.
I know - dangerous to partner with someone, but you have to have allies in politics. Plus, BYU would be joining with a fellow conf member in our debt - never hurts.