The QF article mentioned, their aim is to have 2 locations, as they won't be able to accommodate the training output from a single site.
One of the training locations should have an ILS and be located close to other navaids.
Alice Springs: I don't think so. Dust storms, also students can get lost on navex's due to it's remoteness.
Wagga Wagga: A major flying school is there.
Dubbo: Could be one of the locations.
Tamworth: Yes. For the advanced training part also it's close to Dubbo.
My pick: Dubbo and Tamworth.