7 years on from posting here in 2015. Sharing my experience.
I adopted my daughter though S.I High Court (as Tony Dyson explains). The legal process was relatively straight forward. However, made complex because my lawyers were dubious and dragged their feet. I’m told that is fairly standard practice in S.I law.
Because I had lived in S.I for some years the Aust Gov recognised my °µÍø½ûÇøriate adoption.
I then applied, from outside Australia, for a permanent resident visa for my daughter. Processing took 12 months.
Last year she became an Australian citizen.