To me there seem to be quite a few candidates for speci.es which would possibly match this caterpillar which show the same general 'inch worm ' characteristics within the family Geometridae. A side view showing the leg pattern would help more and a side-on of the mouth parts and or rear of the caterpillar.I am open to be corrected but have not been able to find an image of a species which matches this image.
Yes, rearing caterpillars and growing them out to adults on a collected native food plant would reveal a lots about many Australian moth species whose life histories are poorly known.
I went out but couldn't find it. Did find another wonderful caterpillar though. I grew the caterpillar up for sighting Geometridae sp. (family) (Unidentified Geometer moths) on 10 Feb 2019 but the moth has not yet been identified.