Most likley event that , might interesed the Lord Seventeen, to start a colony in Australia could be if Tasman had the corage or will or what ever was wrong with him to prevent to folow the most ambitious instructions of governor Van Diemen, he could have well found fertil land in the East side of Australia. Maybe giving the Lord Seventeen ( board of directors of the United East Indian Company ) a reason to start a peoples palntation in order to grow crops to feed the trade factories in Asia. An iedea which was living also earlier with people as Governor Coen.
Red 1st vojage of Tasman 1642
Orange 2nd vojage of Tasman 1644
Green 2nd vojage of Tasman if he had the corage to follow the prefered, first orders of Governor Van Diemen.
An other reson to start a kind of colony or outpost in West Australia was not as refressing station as the Cape was, but more as a kind of safe haven or salvation station for ships who mised the turn North to late and came to close to Austrailans West coast and even stranded.
A third, I find the most interesting, option is a colony or colonies, at the West coast of Australia established by shipwrecked peolpe, with or with out Abolriginal support or even close relations. ( as example a more differnet turn of events with the Batavia disaster) Supose some self suppporting survivor comunities were discovered in the 2nd half of the 17th century, the Lord Seventeen were giving the unlnown continent more attention again.