I saw an interesting innovation in Warriors of Dyfed. It uses one of the d6’s in the move roll to determine damage. It made me think of World of Adventure, since the only dice used are d6’s. Perhaps it might look something like this:
When you attack an enemy in melee, roll+STR. *On a 10+, you deal your damage to the enemy and avoid their attack. The damage you deal is equal to the higher of the two dice rolled, plus your playbook’s damage bonus. At your option, you may choose to do additional damage equal to the lower of the dice rolled; if you do, you also expose yourself to the enemy’s attack. *On a 7–9, you deal your damage to the enemy and the enemy makes an attack against you. The damage you deal is equal to the lower of the two dice rolled, plus your playbook’s damage bonus.
Of course, I haven’t figured out how to incorporate the enemy’s damage yet.