I came across some unknown plants during my working bee on the 17th of Aug, 2024. One was a vine which the facebook NSW plant identification group identified as Clematis aristata.
It does appear to match even though the documentation online for it is not extensive.
Here is the entry on the plantNET site: https://plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?page=nswfl&lvl=sp&name=Clematis~aristata
It does appear to be endemic to the area so I made the right call in leaving it alone. I’ll be interested to see it blooming come spring.