There seems to be two schools of thought in the US critter types, those who don't want to help because it may impact US force levels and those who want to help because they think it will get Australia to pay to expand US industrial capacity, especially increase jobs in their constituencies.
None of them seem to grasp the logical middle road, Australia expands Australian capacity and feeds extra capacity into the US program and maybe the UK does as well. Each does the dollar value of their procurement worth of work but aims for efficiency to reduce costs for all on common components and sections.
Once again, this had to be looked at as practically as possible.
An honest assessment of how long it would take Australia to get into position to build nuclear submarines would have to be conducted.
I assume this is being done with the results being fed into the decision making process.
I'd like to see Australia get their nuclear submarines before Mandarin becomes the official language there.