Decided to go with the historical Japanese invasion plans as outlined in Christopher Shore’s Bloody Shambles. His account of the air campaign is one of the most harrowing tales of military history I’ve read.
The Japanese landed on the west coast of Malaysia and the northern Philippines. Each landing area was outside of the (Turn 0) reduced Allied air umbrella.
Both Japanese beachhead assaults resulted in D6 roles of six, with the defeated Allied forces captured (with accompanying victory points). Each assault was supported by naval aviation assets.
In the following first phase of Turn 1, the Allies counterattacked. The American attack disrupted one of the Japanese beachheads, while the Japanese in Malaysia were forced to retreat.