A logical spot for Dutch Australia would be Swan River, not Tasmania.
Remember the Batavia! A Dutch ship following the westerlies to reach Indonesia crashed on landfall to Houtman Abrolhos.
Now suppose that East India Company plants a colony at, say, Swan River mouth. A small castle, a few hundred farmers in the immediate vicinity, a few small sailing ships and boats, maybe a few lighthouses. And a scattering of outposts, with a few settlers farming and trading with local Aboriginals on coast each hundred kilometres or so.
An East Indiaman coming from Kaapstad can target a landfall at Rottnest Island Lighthouse, take fresh water and fresh supplies - then turn to Batavia.
And if any ship misses a landfall and wrecks either north or south of Swan River, local friendly aboriginals would bring a word to the next station, the squatter there would promptly send a horse rider to Swan River and a few boats would return to supply and evacuate the castaways.
The Dutch who get sick in the hot tropical climate of Batavia can be evacuated to the rather more moderate climate of Swan River. Much closer at hand than all the way to Holland, or even Kaapstad.
Also supplies from Mediterranean climate that do not grow in Java can be imported from Swan River, not from Europe.
Would this make economic sense?
Note: if the colony is closely connected to supplying Batavia, you can expect the Dutch to import a fair number of Sundanese and Malays. With their tongue and race.