As US I always leave the infantry, fighter and destroyer to make Japan send at least a few ships and a pair of transports. That way it sucks up some Japanese resources off of the vulnerable powers.
I’ve tried loading Philippines with as much as possible to put a rock between Japan and India in case of a J3 attack. I can get a couple of fighters, a tac and four infantry there by that time, which is a lot more annoying than it sounds due to the fact that the airforce can be in either battle: They have to put enough in the sea to take out a 2, a 3, and a pair of 4’s, as well as enough on land to take out 4 2’s, a 3, and 2 4’s. That’s three trans and some airforce on land, as well as a few ships and some airforce in the sea just for the one island, and he’ll still take some casualties.