I will echo what FF said. A KK42 would be a little iffy in open ocean travel. They are great boats. But I would not consider them passage makers. They would be perfectly suited for what you want to do once you get it to Aus. LIke someone recommended, if you really like that boat, have it shipped down under. I think Dockwise Transport is the folks that specialize in that stuff. I know when we are in the "dream phase" certain hurdles must be cleared before it can become a reality. This may be one of them. I guarantee you that these folks are very familiar with your plight and the DO have the answer...for a nominal sum of money of course. But if it is within the confines of your budget, then the dream can get closer to being real.
http://www.dockwise.com/page/yachttransport.html