We'd need more planes (refer to my other wishlist post) and here is how I think HTC would do it.
Each Task Group form each country would be unique in it's own way. If it were British for example, it will be strong, durable, harder to take out, but less guns on it. If it were Japanese, it would be easier to take out, but a whole lot more guns, American, well, it could be a perfect medium I guess... Thats just how I see it
I like your idea, but we need the Fairy Swordfish, Blackburn Skua, that other plane I put up on the wishlist (cant remember the name right now...), and a different model of Seafire if it were to be British. Just my opinion though