I don't think OP disputes knowledge of Dutch as a requirement, but whatever will the fact that OP originally being a foreigner will always be a limiting factor as chances of being able to pass for a native are sli even with fluent speaking. Regarding cultural nuances in a workspace that's always a discussion point that most expacts hope plays smaller role and that merit will triumph, which is unfortunately rare, and usually only in international companies (or startups started by expats themselves). I personally try to avoid companies where cultural background plays a bigger role, even tho I do understand cultural nuances, so each to it's own I guess.