I think the 20 TWC would be the least of your worries! I'd be more concerned with the 800m viz and +TS/CB overhead the field. Why would you even go near it let alone try an approach in it? Think of the down draught.
I know it's easy to sit and pontificate after the event but from what we know so far, on the face of it, this seems to be yet another accident caused by commencing an approach in totally inappropriate weather.....how many more?