Well, what if different guns were available (pilot level) and more bomb & torpedo types. Those would be easy builds. Engine upgrades (supercharger), drop tanks, add a couple of rocket pods, extra ammo, rear gunners, etc.
Seems to me adding a couple more T2-4s similar to T1s and Locals being L40 wouldn't be all that hard.
Just build up some more planes, but keep them comparable across nations.
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