Maybe not a prize per se, but would it be possible to have a re-roll option for first and second if they don't like their prize?
the re-rolled prize would be of equal value, but the catch would be that if they want a re-rolled item they would have to take it. (ex: if someone doesn't like the first item, and chooses to re-roll and they find that they liked the original prize better tough tits and they'd get the re-rolled one.)
Might be messy, but I'm sure it could be doable
also make sure ES can't give grips as prizes