..Slash, mate ... I WAS thinking 200/300 .. thankfully, I have never had the experience in the aircraft.. but the number of times I have failed an engine turning base/short final in the sim and had the pilot
(a) not notice until it was too late
(b) notice but crash anyway (actually I freeze the sim before we crash .. I don't think that the crash has any positive training value)
etc .... are numerous.
There is no "right" answer and a lot depends on the particular circumstances of the day. Still, I have some doubts as to the ability of many pilots to handle this scenario well unless they have given it a lot of armchair thought and had a reasonable amount of practice in the sim to put the armchair quarterbacking into action.
Regarding the numbers, one should keep in mind that the US practice typically is to quote unfactored landing distance with a reliance on the operational FARs to require the operator/pilot to put in the fudge factor. I know that some operators permit the use of the QRH numbers without factoring but I think that this is an unnecessarily high risk approach to life unless the circumstances involve a higher risk abnormal or emergency situation ... just my opinion .. but, then again, I'm a devout coward.