Pilots will sell their soul for cash!
I agree with that. But it has some potential for a win win situation.
Why not introduce a bid for 75 / 85 / 95 / 105 hours?
Logically enough they'd have to up the overtime pay which should set in at 80h.
The individual can then decide if he needs a slow month or if he wants to make money.
I bet that the manning problem will ease just as the fatigue issue will.