With PoD around 1400s at the earliest, make the Dutch to be possessing the capability to acquire at least Algeria, Senegal, Mauritania and Western Sudan (Mali and Burkina Faso, primarily) as their colonies, either under direct control or through VOC-esque trading company, or the latter first, then the former, as in OTL Indonesia's case.
The Dutch people which will be engaging in this scenario must be protestants, or at least their Christianity must be cut off from Rome and has as substantial differences as OTL Calvinism with Roman Catholic Church. Therefore, the later the PoD, the better. Preferably after OTL's date of Dutch independence from Spain. Besides, I'd prefer the process of Dutch colonialisation of the region to be somewhat resembling OTL's colonization of the region by the French in 19th century. Hence, having this be done without industrial level technology is not recommended, but isn't probihited whatsoever, if it can lead to the process of colonization to be just slightly slower compared to OTL French case. Also, the spread of Christianity by the Dutch musn't be more widespread then the result of French efforts to spread Catholicism in the region IOTL.
The Dutch people which will be engaging in this scenario must be protestants, or at least their Christianity must be cut off from Rome and has as substantial differences as OTL Calvinism with Roman Catholic Church. Therefore, the later the PoD, the better. Preferably after OTL's date of Dutch independence from Spain. Besides, I'd prefer the process of Dutch colonialisation of the region to be somewhat resembling OTL's colonization of the region by the French in 19th century. Hence, having this be done without industrial level technology is not recommended, but isn't probihited whatsoever, if it can lead to the process of colonization to be just slightly slower compared to OTL French case. Also, the spread of Christianity by the Dutch musn't be more widespread then the result of French efforts to spread Catholicism in the region IOTL.