Take the coastal question first. The corrosion rule for metal roofing draws its line at one kilometre, and past that line the requirement is the ordinary inland one. This locality sits past it. Ask whoever quotes which side of that line they have placed the work on, and what put it there.
Wind is Region B1 here, the same region as Brisbane, so a quote pricing a different wind region has to say which one it means.
The character-area check is the strongest, because the list is closed. The planning scheme's provision that can make a change of external roof material assessable applies inside exactly fourteen named areas, and Pacific Paradise is not among them; if anyone raises a character-area requirement, ask which of the fourteen they mean.
The coastal protection overlay triggers on a new building or added floor area rather than on work to an existing house, and the bushfire and landslide codes contain no roofing provision at all — that is what the codes say, so ask any overlay claim to point at the provision behind it.
ABS puts separate houses at 73.9% here against 74.8% across Queensland, so a claim that the local building mix calls for something different has a figure to answer to.
No dwelling-age or build-era data is published for this locality, so roof age is something to establish on your own roof rather than from anything published. Under the planning scheme this work is accepted development with no requirements applicable, which leaves condition and scope.