Subversive thought.
Don't bother with getting exemption, you call ATC as you cross border - has anyone had ATC query you about if you're aircraft is legal or has exemption? Ever? No, they don't know, they just assume or don't even care. Only time this would potentially be a problem is if you had a ramp check by the Dutch CAA on the ground. But then it's better to ask forgiveness than permission.