VA ADL - PER, no J with the 320, and it looks like as if VA is happy to have it this way.
So, if living in ADL, and happy with Y, then its VAd ADL - PER then ANA PER - NRT (putting into the booking your SQ KF #).
Then transfer the KF miles to VFF, with a bit of a loss.
From PER T1 VAd to T1 int, its just a short walk.
ANA will allow a booking on their website, fly VAd from ADL, under one PNR, so no need to approach the VA desk in PER, as passport swipe would have been done at ADL.
Think the last time I had a look, the linked VAd flight still had the VA flight number, not NH, so not sure what class of travel, and if points will be earned in KF for the ADL - PER sector, but will be earned for PER - NRT under NH and *A.
Yeap, SIN is a great airport to transit through.
But so far, I am having my "kicks" in NZ, Japan for me will be a far off one to go, down the runway, far down the runway.