The free trade
idea could work
and I recommend a knowlegable Import
Agent and to enter in a port you want to spend some time at as above you will be restricted to port until the money
is paid .
Any chance of using the free trade agreement will require an authentic CERTIFICATE OF ORIGIN via the builder
and overseas Govt Authorities .
Tricky with used boats .
I only mention this here as general info .
Aust has a free trade agreement with Thailand
also where my boat was originally manufactured I suggested to Customms on my arrival I would try to claim exemption and then realised it only applied to the Duty of 5% .
I believe the GST still applies .
The laughter from the officer was also convincing.
BTW Broome WA is not a safe port of entry for small vessels.
Harbour control are nasty and expensive you are also demanded to tie up to a most ridiculously high wharf with no help given .
They cannot provide assistanceand still demand the only first point of land is the crazy wharf to allow the Customs and Quarantine on for two hours .