I think that it would be nice if you would go into more detail about the projected USSR and UK moves. I’d rather not post a lengthy reply, then suddenly find that there were 6 infantry and a fighter in Burytia (the UK fighter from the Indian Ocean) when I assumed there would be nothing, or find out that there was an Indian IC, or something similarly important.
Faced with an Indian IC and a unified fleet southwest of Australia - well, assuming no other unusual factors, and given that I don’t have a board in front of me, I can’t say for sure. But I’d probably do something like build three transports off the east coast of Japan, or perhaps two transports and a fighter, leaving the Jap battleship at the east coast of Japan there as an escort, and unifying Jap carriers and the second Jap battleship at the Solomons off Hawaii, and sending sub, destroyer, fighters and bomber to Pearl. I lose the sub, and possibly destroyer and fighter as well. However, Japan will NOT lose any more fighters in the forseeable future, unless the US decides to attack Solomons, which is probably a bad move. On J2, the Japanese navy moves west, or southwest from Solomons.
Basically - you sink 15 IPC into an industrial complex which must be protected; this relieves pressure on Germany. Also, you unify the UK fleet in the Indian Ocean. This is supposed to put pressure on the Japanese, and it does. It also puts pressure on the Germans in Africa. But now you have to protect London and Calcutta, and the only expansion point from India is French Indochina, which is only one transport trip away from Japan. So now what? The Soviet Far East collapses (no big deal), but more importantly, the Allied attack on Germany slows to an crawl, and Japan starts running a gigantic tank force into China, from where it can unite at Novosibirsk with infantry coming in from the Soviet Far East (and they cannot be dislodged unless the USSR has a gigantic force in Moscow, which is improbable given the fact that the Germans will have less pressure applied to them by the Allies). The tanks in China can also hit India with any French Indochina infantry. Japan can even just let French Indochina be taken, since it can take right back with six-eight infantry from Japan, tanks from China, and air force. This is even easier because I presume that the Japanese transport off Kwangtung survives in your scenario, which means four additional units in Asia by the end of J2.
I’m not saying that unifying the UK fleet southwest of Australia combined with an Indian IC is a BAD move, but I think I would certainly change some things in your proposal, like two USSR fighters in India, among other things. The general picture I get from the description is a UK strongpoint in India and better UK control of Africa for the first couple of turns, but a horribly weakened USSR-German front (the USSR fighters cannot afford to stay in India), as well as a considerably weakened UK/US vs. Germany attack. The unified UK fleet can’t do much on offense because UK fighters from London can’t reach for a couple of turns (by which time Japan can bring the entire power of its navy and air force to bear), and the added punch of a bomber just isn’t enough against a battleship, two loaded carriers, and transport fodder, which is what you’ll face as early as J2.
Note that you probably won’t be able to unite the UK fleet with a US Pac fleet, because the order is UK-Japan-US. So if the UK fleet moves within Japan’s striking distance, Japan will probably just kill it. The order must be the US moves in, then UK reinforces, then Japan is faced with a unified navy - but that’s very difficult to do unless the UK fleet sneaks south of Australia, which means that it can’t slow the invasion of India or lend support to Africa at all. As for forcing the Japanese to commit their fleet to attacking the UK fleet, and having the US counterattack the weakened forces, I don’t see it happening, given the map.