Try and Islander/Trislander, Twin Otter etc. No cockpit door, in fact you may end up sitting next to the pilot. Maybe not ideal for the nervous pax. And I always remember departing Heathrow on a Lufthansa 737-100 (yes, a -100) which had a curtain door that wasn't closed - on a reasonably calm day I was surprised how much difficulty they were having keeping it straight as we accelerated.
But then I'm one of those possibly irritating passengers who prior to 2001 would regularly request a visit to the flight deck.