How would this work?
Suppose you could hold the 777 but would rather for whatever reasons fly the S80 on short haul.
Suppose I could never touch the 777 due to seniority but it would be my dream to fly international.
If we had a system to bid a position "alternate pay" (or what ever you wanted to call it) where you could bid to fly the S80 at 777 rates cause you can hold it and I could bid 777 at S80 rates because I can't whereby you couldn't get the bid unless someone like me wanted your seat at the lesser rate and even at that you would get the alternate pay position by seniority only. No one would be out any extra money, including the company. I wouldn't be getting screwed because thats what I would be making anyway and you wouldn't be awarded the pay unless there were bidders like me to create your slot. We would both be happier and making the same money we would have anyway.
Just a thought, probably full of holes but surely with some thinking outside of the box something could be engineered.
CG