You said it yourself-it’s hard to pull off and the Soviets will crash hard into the Axis. I still think it’s hard for this reason:
Japan can never assemble enough troops to land anywhere and succeed (or at least land on the West Coast), because Japan has to spend 7 more IPCs for every two units than the Americans. The Americans also have a home ground advantage, so more turns of builds would reach the front in time. Then there’s the problem of the US making more IPCs than Japan.
Italy can easily be blocked from Gibraltar on the first turn by having sea zones 96 and 95 attacked, and having at least one ship present in each zone.
Anyways, I do sometimes dream of a stupid US doing a KJF and letting Germany land on the East Coast, sacking the US the turn they enter the war.