supported, or on your own
There have been a few companies that ran fully supported bike tours to the Outback.
ROC, Remote Outback Cycling, was terrific, with, for example, a 45-day Townsville-to-Broome via the Savannah Way; or, Gulf to Gulf, cross-country from Port Augusta to the Gulf of Carpentaria via the Birdsville Track; and plenty of shorter trips.
Sadly, all history now. You are on your own as far as long-distance Little Adventurs go.
Australian Cycle Tours offers a few short trips with a week-long maximum riding period, some with ebikes, but these are relatively expensive, and you won’t be sleeping in a tent.