That sounds kind of fun and interesting, but it also supposes a Japanese invasion of Hawaii which wasn’t their intent. The attack on Pearl Harbor was only an air strike against US Air Bases and the Pacific Fleet. Japan had no plans for actually invading Hawaii, at least not at that point. Still an interesting idea.
What about a WW2 style Fortress America game? You could have Japan be the Western Invader, Germany the Eastern Invader and Italy the Southern Invader. Make it just like Fortress America where each player gets 60 units split up between Infantry, Artillery, Mech Inf, Tanks, Fighters, Tac Bombers and Bombers. America would also get Partisan reinforcements, perhaps represented by HBG Marine Infantry units, or the Marine Infantry from the old Pacific game if you have them. Heck, they could even be represented by the Light Grey Axis Minor Infantry since Partisan units in the new Fortress America game are grey. Another idea would be to use the Light Green Neutral Infantry from HBG. Even Chinese Infantry would work in a pinch.
Perhaps the Laser Complexes could be replaced by Atom Bombs. USA gets some sort of marker to represent an Atom Bomb base each turn, placed in a US controlled city, and they get so many Atom Bomb strikes per turn, depending on how many Atom Bomb Bases they have. When Invaders capture cities with A Bomb Bases, they destroy them immediately. A low-yield Atom Bomb would be enough to destroy 1 military unit and could possibly fail, thus the roll of the dice.
Perhaps the USA should also get AA Guns for defense. A certain number of AA guns in each city and only in cities and don’t count toward the 5 unit per territory limit. They act as normal AA guns in Global, up to 3 shots per gun or 1 shot per attacking aircraft, whichever is lower, and can be taken as casualties in defense. If you don’t like the Atom Bomb idea, perhaps AA guns could be the extra defense ability for USA. Each city starts with a certain number of AA guns, maybe 2, and each round USA gets a new AA gun to place in any city they still control. Again, AA guns would not count toward the 5 unit per territory limit.