A few problems with that idea.
UK can probably retake alaska or atleast weaken your forces there with 1 inf 1 arm.
US keeps there NO because they’d have midway, wake, and Solomon.
You best keep your destroyer alive or else a sub drop alone will secure there coast (just the fact they can sink your carriers in response)
US can easily shift 1 inf, 1 art to central US, pull back the AA gun, and keep there planes in range to retake LA, stalling them at most 1 turn from africa.
I think you’d be better off hitting Hawaii and buying 2 transports + DD and shift the cruiser to japan, then threating a turn 2 grab of alaska + western canada and setting up for a train. The interesting thing as well is if you move the BB to wake and have all 3 carriers plus your DD and within range and hit Hawaii there is absolutely no fleet purchase the US can make that can survive an attack on J2. Not sure what can be done to capitalize on that but hey.