Simple, really; reorganise the 88mm base flak guns so that each airfield has a single four-gun flak battery, instead of individual guns. The player is located in a central directing post which, if destroyed, has the effect of disabling all the guns*. They fire in unison, with a certain amount of spread. I was thinking of
this photo here.
Or alternatively get rid of the auto-ack around the strat targets and replace them with these batteries. The gunners will have fun blasting off their four guns and there would be slightly more of a skill element to flak, rather than dice-rolling fuel leaks etc.
* Otherwise the gunner would have four "lives" versus the pilot's one.