You are missing the point entirely, the Commonwealth of Australia is the flag authority, and the signatory to the various regulations and treaties. The RAN has no say in it, they are what the CoA signed up to and the RAN, CASG, NSSG, the builders and designers, are obligated to meet.The gov't kicked the RAN out of the project after they asked for a short list of acceptable ships. Are they going to let them back in to negotiate changes? All evidence suggests that the RAN is getting an unmodified design from the builder and will have to adjust to that design, not adjust the design to them.
There kinda is IMHO. There are limited options available for an A200 when you look at the catalog. You can pick between three(ish) different guns, two(ish) different CWIS a few different sensors thst will actually fith within the cooling, power and space limits etc... but it's relatively limited what can be integrated and what can't with the baseline. I really like the A200 except for the exhaust issue fogging the stern at low speeds. Tugs and harbour evolutions may be challenging if your breathing in diesel exhaust while trying to work lines.
Waivers can be obtained but the process is strict and complex. The obligation from the government is to where possible meet the requirements.
Imagine a government determining it was cheaper to import unmodified cars from the US without seat belts.