Cuf for additional headshot resolution seems nice.
What about a stamina roll or get knocked unconscious for getting your bell rung?
I'd go even easier: If hit in the head, make your regular CUF roll but -1.Just another thought - if the goal was no more dice rolls, then perhaps the CUF roll for being hit can be used for head shots:
1) roll CUF as usual for being hit (which is 1 or 2 dice, depending on morale if I recall)
2) if you succeed - all good as usual
3) if you fail, you are suppressed - but
4) [new] if neither of your dice are greater than the damage taken ...... well - you are incapacitated and out of the fight
Personally I think I prefer +1 damage - but I thought to throw the idea out there