I WWII fighter pilots did not usually have the luxury to only engage when they held all of the advantages. The only thing that pushes a score oriented player into similar risk is that K/H is so important. Take that out and then K/D becomes paramount and encourages such players to be extremely timid, flying in a way that would have gotten them court martialed and, in the air forces of some combatants, killed for cowardice. Sure, you did what you could to maximize your advatages within the limits the task allowed, but when climbing to intercept inbound He111s in 1940 you didn't get to turn and run if there were higher Bf109s, when escorting Il-2s you didn't get to abandon them to their fate just because the Luftwaffe showed up in force.
In AH there is very limited pressure to engage in unfavorable circumstances and the OP proposes to remove some of what there is. I think that is a bad idea.