Thanks for the feedback. So it's fair to say they are very rarely (never?) used in Australia anymore?
Yes, that seems to be correct. They used to do them on request when I did initial instrument training in the UK maybe 30 years ago, at East Mids airport, which also had ILS and NDB approaches. I recall they weren't all that easy to do really accurately and needed currency. I think they used to talk us down to about 300'(?). I wouldn't dare ask for one here because they probably woundn't know what you are talking about. It would be good to have the option at somewhere like Bankstown, as an option if the NDB fell over and they could maybe be used to help out with some alternate requirements in many places. Often wondered why they don't do them here, where there are few ILSs and other options. They don't seem to offer them here even as emergency, which has often struck me as rather strange from a safety perspective.