If the Soviets had plans to attack Australia and New Zealand with nuclear warheads out of subs and/or naval ships, I would think it would've made more sense to have subs with assigned targets in the Southern Hemisphere to be based in Vladivostok - or better yet, Cam Ranh Bay in Vietnam (IOTL, there were indeed Soviet subs based there).
PK seems a bit far north, so although it did have a submarine base IOTL and more than likely ITTL, it's much more likely the subs there would've been assigned targets in parts of east Asia, western North America and Hawaii rather than those in the Southern Hemisphere.
In addition to the targets mentioned by Tsar of New Zealand being Wellington and Auckland, I believe in other stories, the Australian cities of Perth, Sydney, Canberra, Cairns and prolly also Darwin were hit. Melbourne was not hit and would later become the new federal capital of Australia. I don't know about Adelaide and Brisbane/Ipswich*, I presume they might have survived in P&S.
There is a short story somewhere in this forum taking place in Hanoi, and it's mentioned as being hit by either a Chinese or US warhead. It's quite likely that Ho Chi Minh City and Cam Ranh would also have been hit by nukes, the latter more than likely targeted by US nukes.
*An RAAF base is located in Ipswich, just west of Brisbane.
So in my TL I followed the continuity established in The Lucky Country so far as strikes on Aussie were concerned: three strikes at the extreme range of missiles from Chita Oblast upon Sydney, Canberra, and Darwin (1MT each), and seven strikes from an SSBN in the Arafura Sea or thereabouts upon Townsville, Cairns, Pine Gap, Alice Springs (there's overkill, if you like), Perth, Fremantle, and Rockhampton (200KT ea).
However, I continue to take issue with the events of that TL, which are rather too sweetly optimistic for my liking.
Likewise, NZ is hit by a Soviet bomber at the edge of its effective range somewhere around the Central Pacific (the implication being Christchurch is spared by a decision to hit Guam (or was it Truk?) instead.
I figure Cam Ranh will get totalled, possibly Nha Trang as well if the Americans are hitting all there can (a pity; I was there last November and it's a lovely part of the world), but there's mention in Ashes of the Dragon of a Vietnamese Federation, implying a surviving state.
I've established that Singapore was hit several times over, as was Kuala Lumpur; the Malaysian government, and feel free to dispute the canonicity of all this as I haven't raised it with the rest of the Cabal, has evacuated to surviving Penang as at ITTL July 1984. Jakarta and maybe Surabaya were also hit; I don't know enough about Suharto's Indonesia to comment on the likely ramifications for it. Survival, reconstruction, crony capitalism??