Well, what about Jerome Cornelius and his bunch of crazed psychos on the WA coast in the mid-1600s ?
Also, I reckon the Dutch policy towards the blackfellas, had they settled New Holland, would've been tragically similar to how the Dutch in New Holland dehumanised, mistreated and massacared the local Indians of New Netherland, as in Pavonia 1643
We actually have a very significant German population in Australia since colonial times, esp in SA with the great no. of German immigrants in the Barossa Valley in towns like Hahndorf, outside Adelaide, some of whom also later moved up to the Alice Springs area as Lutheran missionaries to work with the Centralian Aborigines. Maybe in a TL with Dutch settlement, there could be larger nos. of such Lutherans, whose benign missionary policy towards the Aborigines clash with the Dutch settlers' more indifferent or hostile views ?