Is this “fire report” something prepared by a fire engineer (or registered certifier, fire safety, in the new speak) or some other specialist? Typically a design brief would be offered first by the C10 (fire engineer) and then a FER (fire engineering report) with your selected solutions. If the latter has already been supplied, you would seem to be well advanced in the process.
Do you instead mean something like a BCA survey was conducted to identify shortcomings in the building? Where they were found, usually performance solutions are offered as alternatives to sprinklers and so forth, if not, I’d raise this with the C10 when the time comes.
As mentioned above, Councils generally recognize the limitations of older buildings and after speaking to various experts, only a tiny percentage get hit with fire orders requiring immediate action. In this LGA, 5 year implementation is typical, one of the council officers I spoke with recently on our voluntary upgrade, mentioned some of the orders he has stretch over 10 years…..you need your BCA/project manager to make exception to the yearly schedule of works required by Council in that case.