As I said so many armchair observations.
In Australia we operate 22 aircraft ranging from Metro III to Cessna 310 all SPIFR without incident throughout Australia, PNG and the furtherest most reaches of the Pacific.
This includes some of the vilest tropical weather.
Why bring up SPIFR, it is a fact of life of General Aviation including RPT below 9 passengers in the likes of Piper Chieftains.
The responses sound very much like a Government regulator who will say the safest flying is when all the aircarft are on the ground.
Safety is always easierly bettered with, simply upgrading the means of transport.
I'm sure that a charterer with 4 passengers would love to pay three times more for a turbo prop as opposed to a C310. In the real world the answer is no, and if the cost of the turboprop was forced on the charterer the simple answer is they probably wouldn't fly.
That is the real world of economics in which we all live.