I’m having the exact same problem as the OP. From what I can tell, the most effective way and the way I am likely to do it is go to the USA and do an FAA ATP course with a 737 type rating. It’s still going to be expensive, however I will come out of it with a type rating and the FAA ATPL. The type rating can also transfer onto the Australian licence, and if I really want to I can convert to an Australian ATPL by doing the flight test. I don’t think I will get much change from $30k Aus, but will have a very useful licence. Probably not the way everyone wants to go though.