Members of the Australian Orthopteroids Facebook group, including Matthew Connors have given an alternative ID of a male Olive-green Coastal Katydid, Austrosalomona falcata.
I forgot to add that I have recorded an undescribed female Austrosalamona sp No 9 from a Gymea in ANBG. So it may be better to call your Austrosalamona sp. as it is unlikelt to be falcata so far from the coast.