Jackc, you might want to consider the standard penalties for flying an unregistered aircraft, or flying without a pilots licence/certificate, if things go pear-shaped, and don't follow your carefully-orchestrated, secret aviation plans.
One standard Commonwealth Penalty Unit is currently $330 (current as at 7 November 2024, and subject to indexation), so the cost of 50 PU's is $16,500 today. Then, there's the little issue of the damage or injury caused to third parties during your unregistered/unlicenced flying operations, that went contrary to all your carefully-laid plans.
It's odd, how someone, or someones elses valuable property, often has a nasty habit of being located in the wrong place, at the wrong time, when you have a little "flying upset" - no matter how remote the location.
https://classic.austlii.edu.au/au/legis/cth/consol_reg/casr1998333/s200.030.html
One "sovereign citizen" of Mackay Qld, who killed his passenger when he crashed whilst flying unlicenced and unregistered over Ball Bay in Qld, managed to squeak out of a manslaughter charge on technicalities last year - but he still faces a trial on another 6 aviation charges this year, one of which charges includes operating as an unlicenced pilot.
But perhaps the worrying part is the potential civil lawsuit still hanging over his head for the loss, or losses, associated with the death of his passenger - who was apparently a "good mate". It seems like the families of the deceased are not such good mates nowadays with the unlicenced pilot.
But according to reports, the unlicenced pilot makes weekly phone calls to Donald Trump to sort out his predicament, and to have all the Australian aviation charges dismissed, so I'm really interested to see how that's going to work out for him.
All I can suggest is, if you want to carry out lots of secret, unlicenced/unregistered flying activities, far from "prying eyes", then you'd be well advised to have a top-class KC on your list of close contacts.