Selling the bike in Australia
If you are going to sell the bike in Australia .. you will need to import it. And any buyer here will need to register it , and that means it will have to be approved in some way to the 'Australian Design Rules' or ADRs ... it won't be cheap! Lots of paper work.
One way around the ADRs is to have an old bike - one before the ADRs ... about 1975 IIRC? There may be an import thing where once the bike is past a certain age? 20 years? Don't know - look it up.
An alternative is to have the bike broken up into parts and sold for spares.... the engine will not be usable as a whole but must also be broken up for spares.. they do keep track of such things with the engine number.