The QLD system is just a matter of selecting a provider and ticking their box, you don't have run around and actually do anything.Down here in the island state the CTP is paid at the same time registration fee is paid, which is so much simpler. We also only have one provider of CTP which is MAIB (Motor Accident Insurers Board) https://maib.tas.gov.au/
We used to be just SGIO, you would have to go to their offices, get your green insurance certificate, then head over to Main Roads with it to register the car.