The one that came down in Norway couple of years ago seems to have been equipped with only one of the features you propose.Should all helicopteries have ejectable rotors and ballistic parachutes? Should I make crude drawings of this and present them there as a revolutionary idea to make Not_fixed-wing-aviation safer? (I'm missing that kind of posts...)
https://www.mirror.co.uk/news/world-new ... ed-7865478
https://en.wikipedia.org/wiki/CHC_Helik ... Flight_241
https://www.youtube.com/watch?v=0ZbTN6pM2SE