I think the points being made were:
1) There is no published procedure at Perth for the VOR Approach - such approaches are usually constructed by experts within the CAA who more often than not very experienced pilots and/or ATCOs, who study every possible factor to ensure it's as safe as possible.
Given what's been said it's perfectly possible that someone at Perth has taken the time to construct a procedure of sorts, but it is clearly open interpretation by anyone as opposed to following an official chart.
2) NATS, as owners of the VOR, can switch it off at any time without notice, if that happened during an unofficial approach, well - some could cope, some might not.
3) Who else is flying the approach when you are? Naturally, good airmanship dictates that any pilot flying an instrument approach would make the appropriate R/T calls, but the unexpected does and has happened.
4) If a pilot "flying the approach" had a mishap, would they be covered by their insurance? Probably not.
5) Does anyone here fly instrument approaches purely by using a reporting point instead of a Nav Aid? (with regard to the replacement of VORs with reporting points).
I genuinely think that if the owners at Perth approach the CAA with regard to constructing an instrument approach utilising the VOR, they'd get a constructive response.
Clearly there'd be a small cost involved and it probably would be restricted to those given CAA delegated approval by Perth, but it not much for knowing that what your doing is as safe as it can be.