If the moderators don't know what these larvae will become, I have collected a few of the larvae in a jar with some of the leaves and will see what eventuates.
We did and as a result we have decided this is a Eucalyptus beetle and not a moth. Interesting. Will do this with other caterpillars.
Is it possible the larvae are from the beetle??
They are destroying the tree as you can see in the accompanying photo.