TC.
I'd like to see you install markerballs while staying out of the HV curve.
These aircraft were made to be hovered. The utility industry is proof of that. There is an increased risk when hovering in the curve, sure, but when looking at that risk along with all of the other risks we are exposed to its a drop in the bucket, hardly the difference between a mission that is overall safe, vs unsafe.
The statement in the RFM is little more than a disclaimer not "sound technical adivce". If you need to be there to work, you need need to be there. I dont know anyone who would spend more time there then is needed to do the job.
Before you say, re-evaluate the job, the aircraft, etc..... that is for a different thread....