Why not? Jews are effectively semi-autonomous across the world in terms of having an independent religious leadership, independent education systems, Jewish political organisations and secular Jewish institutions, preservation of Hebrew language and so on. If integration and multiculturalism are impossible, neither you nor I can coherently be called "Australian Jews.".
Are you referring to "cultural defenses"? In Australia the situation is quite good so far as these go. But I think you're overstating your point. There aren't many people who would be willing to come out in support of honor killings on the basis of cultural respect or whatever.