In the mid seventies I flew Navajos for Australian Air Charters into Gabo to service the Light House every Thursday (when it was manned). Graham and Dot Campbell were the husband and wife team living there. We would wait all day for him to answer his mail while Dot would make us scones and jam. A very pleasant day out. We also operated an Aztec but with better brakes, the Navajo was preferred.
I fail to see why, in today's world, a piston aircraft is deemed unsafe. We didn't wear yellow vests with dangly ASIC cards or carry our license and medical, had no OZ-Runways, GPS or I-phone, just a WAC chart. So if anything it would have to be much safer today.