It just doesn't make any kind of rational sense. Just think about it, the P4 already have a massive pay out, they are extracting the maximum amount of money they can. Where would this money come from? If it existed wouldn't you think it would already be proposed?
The average G5 makes $1-2m a year, the B1G distributes $60m, the SEC $51m, the Big12 and ACC $44m. These teams don't need the G5, they can split off any time they want and take the vast majority of money with them. The G5 have 0 power in getting any ideas or proposals passed, it's why these conferences created autonomy for themselves. It's also why they get 90% of the CFP money, that's right, 90%. The G5 that's nearly half of FBS gets 9% of the payout. UNT will get $2m a year while B1G and SEC get $21m a year per team.
I'm trying to say this in the nicest way possible, if you think about this in any critical thinking type of way it's clear that it would not make sense for any P4 team. No team is going to agree to lose that kind of money.