Another possibility - the Southern Highlands area south of Sydney.  A lot of private boarding schools, historic houses with large garden estates, affluent people wanting the rural lifestyle in comfort!  e.g. the town of Bowral.  Many celebrities have property in this area.

You could perhaps find an established homewares business that could import your wares exclusively, you could offer custom-made signs.  As you mentioned if you moved here you would need to source a different kind of timber.