Did you want to hold Hawaii, with infantry or with air units. (This is for a Europe centered U.S. that only seeks to delay Japan)
If you have a secure fleet at Hawaii, and you use 4 transports that permit you to send two to Hawaii and two back to W. US. then in theory, you could get by with as few as 4 infantry a turn dropped off in Hawaii for a total cost of 12 IPCs a turn. Plus a start up cost of 14 IPCs for the 2 transports, and the whole starting fleet based at Hawaii for security. After 4 turns, you could have 18 land units plus starting air units to hold Hawaii and by the critical turn 7, you would see 30 land units in Hawaii. This means Japan would need a single wave transport fleet of 12-13 transports plus its 3 starting carriers pre-positioned at Hawaii to permit the 6 air units to assist.
If you opted to use 2 fighters a turn, and fly them directly to Hawaii, you would spend 20 IPCs a turn, and be able to use starting assets else where. However, this means that by turn 7, you would only have 4 land units (assumes 1 landing turn 1) and 14-18 air units (depending on if starting units or anzac air joined you). This would only require a Japanese transport fleet of between 8-9 ships.
Personally, the first approach has the best chance of slowing Japan’s conquest of Hawaii with a minimal effort on the U.S.'s part.
However, it is highly likely that Japan would simply focus on Australia and India for the win and thus the above pacifist pacific plan is unlikely to result in a win. I do not see the U.S. capturing Berlin prior to turn 7, but it is conceivable that Japan could have 6 cities by then.
(for my next pacific first camaign)
The allied approach I intend to play test next, will be a US fleet of 3 transports and the rest navy. I would propose a fleet of 4 carriers, with destroyers and maybe a few subs as the primary hit takers, this permits anzac to land its air with your starting air. Your primary goal would then be an economic attack on Japan’s islands and convoy zones. With 6 land units, you can take a few losses, but you will likely need to use air units as casualties to maintain land conquering ability. Air units are the fastest to redeploy. Once the fleet is assembled and deployed, I envision a resupply effort of 1 fighter per turn at a cost of 10IPCS maintenance, so that if the US grabs one island a turn, it can lose 1 forward deployed fighter instead of its non-replaceable land units. With the new air unit moving first to Hawaii, then Australia, then the fleet. If you use anzac transports as the disposable transport for a multiple island per turn campaign, then staging anzac fighters on US carriers, will give you the “teeth” you need to take contested islands. To help the Yanks, I would maybe consider a 2 tank,6 mech build with Russia turn 1 and a turn 2 DOW so that Russia could assist China to maintain pressure on Japan’s land campaign. I do believe that Russia can spare 1 production, its 4 starting 2 movers and its 3 air units for this effort, while still holding Germany as they are likely to spend turns 1-3 against London. This creates a Moscow Far East rapid deploy expeditionary force of 12 land units, with 3 supporting air units for a total strike force of 15 pieces that would yield 4 hits per turn offensively and at an effective range of two spaces, and 7 hits per turn defensively if used to guard Chinese deployments. I would replace Russia’s commitment with 16 of the 18 Far east infantry that would fall back to Moscow for the German drive on Moscow. 2 would remain east to establish road blocks for a mechanized Japanese push.
A big draw back, is that Hawaii will be left vulnerable, and sudden Japanese navy builds could drive back the U.S. expeditionary force. It may be prudent to also build 1-2 subs a turn but that drives the Pacific commitment to 3 rounds of fleet building and then a maintenance cost of 16-22 IPCs a turn, leaving less effort for a mid game turn around on Europe.
This still looks bleak, which is why I developed Operation: Open House. (UK abandoning London as bait turn1, which permits a US turn2 DOW and a contained Italy)