How about trip modification alerts where lineholders are provided an alert for a trip when they transit a hub. Allow lineholders to voluntarily move to a more desirable pairing. You don't want that Omaha, NE pairing in the middle of winter? Well, there's a pairing swap that will keep you pay protected for your original pairing, but allow the company to swap you for pay protection and some amount of premium so they don't have to staff FSB.
Let's work on voluntary ways to solve these issues. Chances are there are a couple guys who would much rather do one of these trips if given the opportunity. Once a crew swaps to the short notice, they now have more time to fill the other pairing or offer it up for premium.
The only con to this type of pairing is they would probably increase sit time in hub cities to allow for company flexibility. So, increase our trip rig and it becomes a win-win.
I think the reality for FSB is there is an extremely small minority of pilots here which really "like" FSB, and they will fall on their sword to keep it.
If you like FSB when you defend it, admit it. For the vast majority of reserve pilots at United, most hate it.