The phasmid species that I wrote about that showed phase change appears to be Didymuria violescens. This photo is of an adult male - I also have some females that have just reached adulthood.
This page lists 'purple winged stick insect' and 'spur-legged stick insect' as common names. I've actually induced one of the males to do a defensive/startle display where it spreads its wings, showing off the purple membranous hind-wings. The habitat seems to match; the page also reports that the species tends to be found at high elevations.