I think you tend to be
a lot more careful/conservative in a piston single or twin and that transfers well to the Twotter style operations. Even better when we had -200 Twotters which had only marginally better performance than an Islander. You only started feeling less vulnerable in a -300 Twotter.
Two engines vs single engine is not the issue - VERY few PNG accidents are engine failure related.
I was never a supporter of 2 pilot ops in Twotters in PNG because,
1/. The likelihood of proper 2 crew SOPs being implemented was always going to be problematic when none of the trainers had an airline background,
2/. When ****s are trumps in PNG you don't have time to discuss it
3/. A new FO taught to 'speak up' when 'uncomfortable' would go hoarse in PNG
4/. After several months of their 'concerns' being essentially ignored they would tend to just sit there and accept whatever happened next.
The accident record since the implementation of 2 crew ops seems to indicate no safety benefit has been realised.
Its all moot anyway - if SP command experience was to become a non negotiable Twotter command requirement you'd park most of the Twotters in PNG.