Your challenge is to create a timeline in which the ethnic Dutch make up the majority of the population in Indonesia/Dutch East Indies with a POD earlier than 1900.
Industrial scale genocide. Otherwise ASB.
The VOC's acts of genocide "only" killed several tens of thousands, not the tens of millions necessary for Indonesia to be majority-Dutch at any point after 1600.That's what the Dutch East India Company essentially did in the Moluccas in order to maintain a monopoly on spices. Thus genocide, unfortunately, is actually within the realm of possibilities.
Even then, you'd have to move at least half of the Dutch population to Indonesia.I can think of two or three small to mid sized islands Dutch Majority if that is possible. Entire Indonesia is not easy. It is a significantly advanced and a dense population with good access to resources. Such Genocides of that magnitude would immediately be met with strong response by the international community even then. The nearest I can see in this regard is Indonesia being 10-15% or so Dutch by settling peacefully and building opportunities. Nothing else. I wonder if any sane empire would attempt suicide in this manner when it is absolutely unnecessary and illogical to do so.