Outwest - There is an ICAO requirement NOT to deliberately operate OEI on pax or cargo flights. Maybe your jurisdiction ignores this requirement. With a full load and using a 90% Tq reference you probably would not get airborne but with just one pax and a strong wind you probably would.
Nomad - Like many aspects of Cat B - who cares? A lot of offshore ops are Cat B all the time (USA, Brazil and those areas that base their regulatory system along FAA lines)
As I said a lot depends on your jurisdiction and how they apply any rules they do have.
G