The Wikipedia article about the History of Western Australia mentions that the British set up a military garrison at King George Sound in 1826 and established a colony on the Swan River in 1829 in order to discourage the French from settling the west coast. If they had, Australian history would have been very different due to sharing the desert continent*. So I wonder how likely was the colonisation of Western Australia by France.
Or specifically: Did France actually intend to colonise West Australia; and were any resources assigned to this objective prior to 1829?
French sources one way or the other would be excellent.
* A land army for one coast to conquer the other would have been suicidal due to the deadly expanse of the Nullarbor Plain. No prosaic land war in the style of 1812.