If you are willing to go outside of Europe there are all sorts of possibilities.
Its possible many colonies could have been integrated like France did with French Guyana.
Suriname was forced to become independent, so integrating it should be doable.
If South Africa remains Dutch it might eventually get integrated too. It would probably only be Cape Colony though with no great Trek.
Smaller colonies like these are probably necessary though. A dutch Brazil might be possible with the right POD, but it unlikely to be absorbed, its just too big. Same goes for a dutch Australia.
Another radical idea is if the Netherlands leads German Unification. Ive read a couple of TLs where that happens, and with the right POD I suppose its possible, but good luck. If it did happen Dutch Germany could potentially absorb much bigger colonies. Though I think Indonesia would still be off the table.