Too bad the AI can't use a mixed attacking and bombarding land unit. If you make helis land and give them artillery AI strat tks to flintlock's patch they can bombard well now. But they can't attack. And their mobility is wasted being tied to escorts.
What I'm not sure about is what happens when you give a land unit operational range, no bombard range and only the bombing mission. With the Air Bombard AI strt the AI should be able to use it properly. But from faint memory I remember the game being stuck in a loop if that unit is not given bombard range. And if you give it bombard range as a land unit, it will bombard and not bomb even if you click the bombing mission, meaning it can't be shot down by anti air. Helicopters are not artillery.