I also have referrals for the regular Dutch Amex Platinum or Gold and also for the Flying Blue Platinum or Gold Amex cards for NL (this topic) - PM if interested.

To be honest if you consider joining, the sign-up bonuses aren't great, so I'd wait a month or so, unless you need the XP (30 for gold, 60 for plat) from the Flying Blue Amex anytime soon to requalify.