I wonder. I'm on a first class award (Yes, I know waste, but whatever) on a 757 with two rows of first class. If an air marshall bumps you to the back, what would you expect? I would expect a refund of the difference in miles from coach to first, but of course it gets more complicated when you only get bumped one of the ways, or if its only one segment of multiple, etc, etc.
Well, more thumbs down to the sacks of ... well the regulars will know the rest of that sentence
PS- I'm glad it worked out for the OP. Sounds satisfactory to me too.