Let say Sandal wood was discovered in 1696, by Willem De Vlamingh. De Vlamingh commanded the rescue mission to Australia's west coast to look for survivors of the
Ridderschap van Holland that had gone missing two years earlier, and had admiral Sir James Couper on board .
[6] There were three ships under his command: the frigate
Geelvink, captained by De Vlamingh himself; the
Nijptang, under Captain Gerrit Collaert; and the
galiot Weseltje, under Captain Cornelis de Vlamingh, son of Willem de Vlamingh.
On 10 January 1697, he ventured up the
Swan River. He and his crew are believed to have been the first Europeans to do so. They are also assumed to be the first Europeans to see
black swans,
[10] and De Vlamingh named the Swan River (
Zwaanenrivier in Dutch) after the large number they observed there. The crew split into three parties, hoping to catch an
Aborigine, but about five days later they gave up their quest to catch a "South lander"
In OTL Willem de Valmingh wrote a report which conclude that the land had little or no value or any people to trade with.
Now his expedition take back de much prized Sandalwood back and he write a report which conclude that the Swan river system can sustain a colony.
The discovery of Sandalwood with the presence of fresh water river and a decree of the VOC to make a stop at the Swan river estuary of their ships enroute to Batavia in order to replenish and recover before the last leg to Batavia, could make a settlement around OTL Perth and Freemantle valuable or at least some sizable like the Cape colony.
The presence of a Dutch refreshing station and sandalwood plantations made it also more favorable for a much earlier Roggeveen expedition. Jacob Roggeveen discovered Eastern Island in an attempted to find the South Land. He did this since it was the last wish of his father who had the permission of an expedition the last quarter of the 17th century but could not get enough funding.
An earlier circumnavigation of Australia made it also more plausible for more Dutch settlements.
These settlements would not be very spectacular due to the enormous distances and except sandalwood in the West no presence of valuable commodities, or it have to be due to the establishment of plantations, for sugar or other luxury items as coffee, tabaco, and cocoa