Here's some suggested flight plans
YSSY - YMMLTESAT H65 RAZZI Q29 ML
(Departures via WOL, Arrivals via LIZZI)
YMML - YSSYML H129 DOSEL Y59 TESAT
(Departures via DOSEL, arrivals via RIVET)
YSSY - YBBNTESAT H185 ENTRA Y245 BANDA H185 BN
(Departures via ENTRA, Arrivals via CG)
YBBN - YSSYBN H62 CORKY H12 TESAT
(Departures via HUUGO, Arrivals via BOREE)
YBBN - YMMLBN H62 HUUGO Q94 CANTY H119 ML
(Departures via HUUGO, Arrivals via ARBEY)
YMML - YBBNML H66 LAGOB H185 BN
(Departures via NONIX, arrivals via BLAKA)
Here's a map of the region (and ATC frequencies) VATPAC intends to open up for this event.
Note that some airports in Australia both receive airliner traffic (A320, 737, E190, DH8D etc) and have no Air Traffic Control services (They are real life CTAF 24hrs a day), and as such the overlying CTR position will provide IFR clearance, and traffic alerts to IFR traffic flying the class G airspace. Some of these airports have VERY good detailed scenery available - many freeware. This availability of high quality freeware scenery - and routes available for real world RPT airliner flights in and out, may tempt you off the beaten track.
Some examples are:
Ants Aussie Ballina (YBNA)
Brisbane West Wellcamp YBWW
http://australianaviation.com.au/2016/10/cathay-to-start-weekly-wellcamp-freighter-service/