An alternative to an ILS would be a SBAS system, equivalent to WAAS.
Admittedly higher minimums, but more geographically extensive than a single ILS at Mildura, and with the Japanese MSAS system probably available in our region, much of the hard and expensive work has already been done.
In the present election situation, with the sides more competitive, one or other side may be persuaded to adopt this capability as policy.