well the airfield is able to handle a cat3 operation. I later on called the tower and explained the situation. He said that the separation and protection zones are absolutly identical, the reason why he is not doing cat3 operation is because there might be airplanes which can just do a cat 2 landing. These airplanes could otherwise not fly the approach.( weather was below cat1 but not cat3)
nevertheless the question is, if you don`t see anything at your cat2 minima and you are equipped to fly cat 3 approaches, can you just go down these 50 more feet to the cat3 minima, even though the airport is officially not in cat 3 operation?