What if another European power were to establish a colony in South Australia prior to the UK's initial effort in the 1830's? It seems that the French would be most likely, though there would probably need to be some negotiation given any settlement's proximity to the other Australian colonies.
Let's say that for some reason the British efforts in the early 1830's are delayed, and a French mission lands in 1833 (the first British settlement appears to have been in 1836). We have an era of difficulty, as a few British explorers come into contact with the French missionaries, and then in 1843 South Australia (or perhaps Terre Napoleon, as it was named by French explorers in 1802) is confirmed as French in exchange for assurances regarding New Caledonia, which eventually becomes British.
How does French (South) Australia develop now?
Let's say that for some reason the British efforts in the early 1830's are delayed, and a French mission lands in 1833 (the first British settlement appears to have been in 1836). We have an era of difficulty, as a few British explorers come into contact with the French missionaries, and then in 1843 South Australia (or perhaps Terre Napoleon, as it was named by French explorers in 1802) is confirmed as French in exchange for assurances regarding New Caledonia, which eventually becomes British.
How does French (South) Australia develop now?