What about something like Group DC and Individual DC - If someone passes their individual DC by 1, they add 2 points to the group total, and can earn extra points for every, I dunno, 4 points they clear it by. If the Group DC is beaten, everyone succeeds, if the Group DC isn't passed, those that passed their Individual DC's succeed, and those that didn't suffer the consequences? The party could pass on the merits of someone better 'helping out', but if things don't work out, they can still have their successful rolls feel useful.

If Alice, Bob, and Charlie are working on disabling a series of traps together, the Group DC may be something like, 5. A regular success from each person would clear this challenge. The individual DC is 13. Alice gets a 14 on her check, adding +2 and clearing her from potential harm. Bob, the trapsmith, gets a 23, clearing the DC by 10, for a +4 total to the group DC, and Charlie gets a 9. He is going to suffer some if the group check fails.

The Group's Check is 6, vs the DC of 5, so Bob and Alice covered for Charlie's misstep, and the trap was disabled. Had Bob only gotten a 15 on their check, the group would have scored a 4. Alice and Bob may have been able to get out of the way of the triggered trap, but Charlie would have taken it full force.