I'll let you know of any response by private post to preserve......well, things...!
In NZ the power companies have agreed to bear the cost of providing and fitting those orange balls on risky lines which is great but identifiaction of which ones are a danger seems to be causing problems. It won't happen overnight and it won't be all lines.
I still prefer the GPS database and detection idea, although the balls work for those who are not so equipped.
So let's have ALL of them...