dude we (Australia) literally have all the uranium .. we're the ones supplying you
https://www.world-nuclear.org/information-library/nuclear-fu...
As a nation the pivot to having nuclear weapons is quite straight forward. The technology and resources are available, and the infrastructure has been researched and applied at smaller scales in the past. We're also quite invested in hypersonic projectiles, so it wouldn't take a whole lot to arm a formidable arsenal, the highest cost being political capital.
[1]: https://thebulletin.org/2021/09/the-new-australia-uk-and-us-...