Do a search on "Australia" in this forum.

The short answer is a combo of NW / MH / maybe KL. The two possible routings are west DTW-NRT-KUL-SYD or DTW-LAX-KUL-SYD and east DTW-AMS-KUL-SYD.

It's not easy, but it can be done. Call WorldPerks to work it out.