My bad on Oostrander then, it looked to me like a Dutchified outlier for the family, but I did not study it.
Yes, if you are manager, you can change the LNAB to the patronymic, and then it will be perfect for NNS.. Ostrander and Oostrander can both be aka, and then they will work just fine in the search.
The sister Trynjte Pieters I had just requested for PPP because it looked perfect to me as the best choice, as you suggested. And so if it is now PPP, it can be converted to NNS template.
Try to identify your best choice candidate among matches on each person for NNS, and justify with publc reasons. If you feel you are right, then be bold about your choice up front, so that we can follow behind as needed, or we can otherwise counter the choice with a different argument.
Split families is the reason that I only work from matches on the oldest ancestors up. Trying to resolve it well for later descendants who have split parents becomes a nightmare, and leads to disconnects and loose floaters, and bad LNAB choices. Unfortunately, most people seem to do it that way, in a hurry, or whatever..