Hey buddy,
Just did what you're tryig to do. I wouldn't try to convert to a US license until I had ozzie ATPL minimums which are the same as the FAR 135 single pilot IFR minimums here. Then you can convert straight to a US ATP. Otherwise, you're looking at probably $8000US to convert because you'll need a US CPL ME and SE, plus IFR conversion, plus anything you'll need for a CFI conversion. On top of that, you'll need a green card. I got a job here within a week of looking for a job here in the US, but I also got one within 2 weeks in Oz. Keep trying in oz for the time being. It'll pay off if you're willing to wait around for one.