I wonder how Australian French will sound like. Given the large distance from France and the influence of foreign immigrants, there will probably be some differences in pronunciation and vocubulary. Maybe also minor grammatical differences, but that's less likely.
Something that will surely be...
There is another source for possible immigrants: Québec. Between 1840 and 1930, over 900,000 Québecois emigrated to the United States, especially to New England. When the Canadian Pacific Railway to Vancouver opens in 1885, many of these French-speaking people might emigrate to French Australia...
Rugby is very popular in France OTL, so it's likely that it will spread to Western Australia, too.
Another possibility is handball which is also widespread in France.
The Swiss Confederation has been legally independent from the Holy Roman Empire since 1648 (Treaty of Westphalia). Even before that, the Swiss didn't care much about the Germans.