[sc_rufctr]

Can you use a shipping broker? (If Adelaide has them I'm sure Perth does to) They don't charge much and they do this sort of thing all the time.

I used one to import and engine from the US. Really easy and as part of their service they organized payment of GST and import duties.

Another option is "buying" a square meter of space on a boat. It's just a wooden crate 1 meter cubed but there's no weight limit except what the crate can handle. Again Shipping broker can organize this for you.
One issue though is you have to organize getting the stuff to the port at the other end.