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Some of the biggest and best outback towns and sheep/cattle stations would be great.
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YTYA Tyabb - picturesque area, famous for its warbirds and bi-annual airshow (sorry, my home airport).
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Some great ideas here:
Browse available air tours | Australian Air Safaris, by Kirkhope -
Flinders Is. is striking.
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More here:
https://www.flyingtheoutback.com.au/ -
And here:
https://outbackbyair.com.au/ -
Great Barrier Reef and associated islands.
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More here:
https://airadventure.com.au/ -
And here:
Frontier Flying: Exploring the Australian Outback by Air - FLYING Magazine
Let me know if you need more! Fantastic initiative BTW. Cheers.