Japan should try and protect itself if it takes Hawai. The british will send big attacks from india into Japanese controlled Chinese territories trying to create a pathway between shanghai and india.
KAF could be a viable strategy if you don’t do pearl harbour but it allows Britain the major threat to build an army and make India hard to take if Britain build a lot of infantry. KUKF would be more viable and then just pick the ANZAC’s of at you leisure. Maybe preform pearl harbour a little later as the US will look to attack the European Axis’ weak underbelly Italy and you can attempt to make them draw there forces back to the pacific by taking Hawai and threating San Fransisco maybe making Sea Lion more viable as the U.S might not want to risk lossing their territories attempting to liberate the UK. This also means that the Germans don’t have to be as worried about becoming a turtle and can attack the SU.