The Argyle Apples E. cinerea have been planted by NCDC, probably in the 1960s when Hacket was build on the grassy woodlands of Mt Majura's lower slopes together with the dense rows of E melliodora. FoMM would never plant: non local trees, in rows, in that high density, and close to residential houses. Unfortunately, the Argyle Apples recruit into the paddock to the east, were FoMM carried out a lot of work over the past 2 decades.
Hills Ridges Buffer as far as I remember, I'm not sure about rules there. My "good luck" wish referred to convincing Parks to tackle them - too large for volunteers. Even if I'd successful frill I'd need permission; presumably Parks wouldn't like the idea of a row of dead trees close to residential...