The only KJFs I’ve pulled off in 1942.2 against competent opponents involved the air wall to the center. Anything else and Russia just gets screwed too quickly by Germany. If going this route with UK, I think 1 bomber 1 figher in UK, and 3 infantry in India can be entertaining. This takes a little pressure off your early med positioning, since it gives you a way to deal with the Battleship on UK2 if needed (with double bombers). And the second bomber can fly a defensive pip 2 spaces farther each round than a fighter can, so you have a little more reach both on attack and defense. I just think its hard to manage Japan on the water, and unless you can keep India and Moscow effective for as long as possible (which requires aircraft for the defensive bounce around) then the KJF is pretty hard to maintain.
One interesting approach is just to conserve naval TUV as a way of pinning Japan on the home island, cat and mousing it rather than trying to actually draw out the IJN for battle. This is a containment strategy and not a KJF proper, since you can’t take Tokyo unless you can crush Japan’s fleet. But taking Tokyo isn’t always necessary, to me Suez is the early priority and keeping Japanese carriers away from the Indian Ocean and Africa. If you can do that with UK/USA, then its a lot easier to prop up Russia, since Japan won’t be collecting as much money. And then if you can snag one of the money islands with an opportune transport sacrifice that’s great. Expanding production on a money island, even better, but sometimes you don’t even need to move out to force Japan into a naval race. USA can just park it and wait.
Another move to consider in conjunction with the Air wall to the center, is just the rapid bounce from Atlantic to Pacific. The simplest redirects are from sz 22 (Brazil) to sz 41 (south pacific) or sz 23 (West Africa) to sz 27 (South Africa.)
Either location, 41 or 27 will put you 2 moves off East Indies. I think 27 offers a bit more since it covers the canal and is closer to the Center Air wall, but I’ve seen 41 work as well.
Its often easier to press Atlantic/Africa first, so as not to show your hand too early and force a reaction. The Japanese player will assume you are trying to set up for a normal Kill Germany game,expecting you to get all up on France, but then you launch towards Japan directly with your Atlantic fleet, and build in sz56 on the same turn!
This puts Japan in a bind, if they move to counter the fleet coming over from the Atlantic they leave themselves open to a rush across the Pac from W. coast USA, but if they stay in place for the Tokyo shuck, it risks losing one of the islands from the Solomons convergence or the sz 29 sneak (depending on which way you went out of the Atlantic.)
I think sometimes plays like, where you keep the Japan option open, without overcompensating, make more sense on this board than the balls out slam into Japan right from the outset.
The main advantage to the air wall over ships, is that aircraft can help you hold critical territories. India or Caucasus or Moscow, can hold for a few rounds longer, while at the same time threatening the Japanese fleet (or forcing them to expand their ships, to overcome the air threat.)
For me the real risk with sz30, is that the Tiger and the sz53 figher might die on J1. I hate losing US fighters on J1, and will almost always risk a UK fighter or ships to try and keep them alive. Frequently I will send my UK carrier deck along with the fighter to sz61, its expensive as hell for fodder, but worth it in my view to smoke that Japanese transport right out the gate. I’ll save the cruiser to protect the transport, or perhaps just sacrifice the transport to reinforce one way or the other (canal to India, or India to the canal.)
For the Aussie sub I usually back out around S. America, or go to sz37 on non combat (if the Japanese destroyer in sz61 was handled properly.) Going to sz30 requires putting a lot of UK equipment out of position. From sz30 its 4 turns to London, so if the plan in the Pac falls apart and your plan is to pull back Atlantic, you’re looking at a UK5 Europe expansion. If staying put near India, I’d be careful not to take all the production spawns for UK, since USA really needs one of the money islands to get anything going. Optimal KJF conditions are a USA factory on a money island, and the shuck into sz36, so if UK takes all the production away, sometimes USA gets stuck. Just something to keep in mind when considering how to use those UK transports (should they survive the sz30 play.)
:-D