I don't know about XXXX but the Carlton Yeasts apparently came from Denmark (Carlsberg) early on in the piece. TidalPete has made a superb Aussie lager using Wyeast 2042. I've also had success with dried yeast S-189 as it ferments warmish. I think I recall Thirsty Boy, who works at CUB, saying that they start fermenting cold then let it gradually rise to the late teens before sending to the lagering tanks for 10 days.
FYI. When I did the tour of the xxxx brewery a few years ago, the guide mentioned that the original brewer was Danish and that he used a yeast from Denmark which is still used to this day.