If I was playing as Japan and I saw a IPC on each turn in India on UK1 and in Sinkiang on US1 I would spare no expense to go after them both at the result of a detente on the Russian front.
Granted UK could bring over anything that survived the German assault on Africa or the infantry from Syria, but Japan can still take India on J1. This leaves USA to either launch counter to try and retake it so on UK2 they can reinforce or to simply pull back troops into Sinkiang from China in order to defend their newly minted IC.
Granted Russia could help by either moving forces over to help defend or by launching a strike on say Manchuria but in the beginning if J gets a few transpors and goes heavy INF and lands most fighters in Manch, the Russians will be hard pressed to take it and J will have adequate support to take the IPCs in both India and Sin.
Plus this means a much slower overall attack on Germany which maybe gives her another turn to build which means another 11 or so INF for the attack on Russia without having to worry about the US/UK attacks on WEu or the landing troops in Fin/Nw or Karelia.
I think the IC on India is feasible for UK player (I know people have their differences regarding this so it’s an individual thing) and if you can defend it then it’s a great deterrent to the Japanese sweep into Asia. But as for something in Sin, I think that’s more of a later round deal when Germany is being handled and the UK territories in Africa are back in their hands thus giving them the economic output to deal with Germany with minimal US support (UK and Russia) and thus allowing the US to start something against the Japanese from the mainland as well.
Just my thoughts…