But whence cometh 23 or more Australian warheads? They will need to be thermonuclear ones to achieve the objective of holding the Chinese population at threat, and they have to fit TLAM Follow on.
The non proliferation treaty means they are not coming ready made, and even if you are slipped a design under the table, they are not easy to turn into reality. Turning yellow ore into HEU and or Pu ain't easy or cheap either.
Then you have to have won the political donnybrook, before you can even make a serious start.
Good Luck
N