Bankstown to Townsville with a refuel at Roma works fine. Bankstown-Charleville-Townsville is only 35nm longer and as well as fuel, you can get a feed/refreshments at Charleville (check that - but used to be the case!).
Getting into Townsville is not a problem. I think IFR is easier than VFR cause they spoon feed you clearances - but that may just be me. I like to fly high and IFR takes the worry out of getting down if there is cloud about.
VFR is easy too, but you should get your clearance on the discreet clearance delivery frequency before entering controlled airspace and coming in over one of the VFR entry points probably makes it a bit easier.
Controllers a good and generally pretty patient! GA parking is limited but generally do-able.
PM me with specific questions if you wish. How do I know this stuff? Cause I have flown out of YBTL for the last 30 years!
Dr 