Right, they can ship from East to West or West to East, but it takes time to do so! That’s the point!
If you don’t want to go that route, then the transport in SZ 33 seems like an effective alternative. That would give Japan 4 starting transports, coincidentally, just enough to hit Borneo, Sumatra, Java and Celebes in one round without needing to buy more transports! Not that it’s the only option, but the transport is in range of NSW and Hawaii, forcing the allies to concider the SZ 33 fleet as a threat, instead of something that can be readily ignored since it cannot do any permanent harm.
Further, the transport gives a J1 surprise strike the lasting power needed as now 3 transports can hit Hawaii, so you have enough ground equipment to take it and leave enough airpower to hit SZ 26. Thus, Hawaii is a valid landing zone for your aircraft if America counter attacks (not to mention, the 5 IPC NO.)