In Denmark a company called Uni-Fly "pioneered" the winching on/off wind mills and they have been doing it for a good long while now. This is their bread and butter. Day in day out.
Bond have started last winter doing the same from Lowestoft out in the channel.
Both are EC135 T2's very very light. Single pilot with winch-person.
Why? Because it makes sense, they want those things to work at their optimum.
Have a look on you tube you should find a video by Uni-fly.