I also think it would be balanced. The IJA would have great defenses and many players play just to "win" reguardless of the team. (though I just play for fun.)
Still, to be using a flame thrower or satchel charge to take out bunkers or caves, or storm the beach at Iwo Jima, Phillipines or Okinawa, or battle in the jungles of Guadal Canal.