The manufacturers would have to get the unit properly developed and certificated. I did understand the post re lack of certification
As for which Cranes should be fitted with such devices? Any temporary cranes working on buildings which themselves are high enough to warrant anti collision lighting within X miles of an airport or low level aircraft routing to that airfield.
The day after the accident was a deep blue sky day! Very clear you could see the mass of these Cranes which are numerous towering way above the Skyscrapers at heights which for permanent structures would require fixed lighting.
This accident was lucky as apart from the pilot only one was killed! Had the aircraft gone down in a different direction there may have been many.