I used to fly that route in the 90's flying the Tristar 500. I doubt it has changed much since then in terms of the economics, its not really a commercial route but one servicing the needs if the garrison and those who service it.

There are commercial elements, a lot of merchant naval stuff and crew on fishing boats but I doubt there is a real commercial need for the long range flight. Its certainly spartan when you get there.

Beautiful in a Highlands and Islands sense. All types of weather in a day and can be "exciting" to land in frequent, strong crosswinds with plenty of rotor streaming and mechanical turbulence.

As a route, a commercial operator would have fewer restrictions than the military, but suitable diversion airports will always be an issue.