I was thinking since the WW2 assets from 1943 are partially in the game, it would be interesting if it were possible to make a WW2 mod for this game since we have no proper 1943 on PC.
You could have USA vs Japanese forces on a mix of the Singleplayer maps and edited versions of the Vietnam DLC. I am sure with these assets it would be somewhat easy to make a convincing WW2 map pack.
We have how many WW2 weapons already in the game? I can count 5 maybe 6. Hell you could give the Japanese the MG3 as it is a modern version of the German MG42, and as Germany and Japan were allies and did share a few pieces of technology.
We have the Japanese car already in game, pretty sure the Jeep can be found online somewhere and added to the game.
We have enough Japanese and American NPC models, so there is enough for all classes.
Hell, one could even theorize it would be possible to add the Console only version maps from BFBC1 and 1943 to this game since they use the same engine practically.
We already have the planes somewhat in the game now, so would be interesting if a full package could be created.