I have a HL55 attached to my hard hat. I drilled 4 1/8 holes and zip-tied the HL55 directly to my hard hat (I removed the headband). I used zip-ties because screws present an injury risk.
We have an over-reaching safety department also. Usually, safety departments are run by idiots. And I mean that whole-heartedly. I work in the traffic signal industry. So, myself and my co-workers are kind of like "electricians" which means our safety department treats us with super standards, as if we are linemen. Also, NO ONE in our safety department actually understands ANYTHING about electricity. They just regurgitate fears, myths and wives tales. If someone on the East Coast has a run-away vehicle, they start freaking out and make us use wheel chocks on our vehicles. But they themselves don't use the wheel chocks (we drive Transit Connect and Escapes).
Our biggest threat are the crazy homeless people and gangbangers. About every 2 years one of us is assaulted. We have been shot at. Does our safety department care? If that happens, they show up and ask if we had our wheel chocks on the vehicles and our PPE on. The have no input on being assaulted.
Speaking of PPE, they insist we have HV rated steel toe shoes and they have a (fortunately) un-enforced electrical glove policy (we can't do our work with gloves on, and our circuits top out at 120VAC) but yet they insist that we stand in knee deep water during a downpour and continue to do our job. What do you think the voltage rating of our PPE is at that point?? The manufacturer will state that the equipment is not rated when wet. End of story. But our safety dept. won't call us in during wet weather (Seattle, always wet).
My co-worker saw me modifying my hard hat, and started whining about it. There is no way I have violated any practical protection of my hard hat. Your hard hat gets knocked off your head by any impact that isn't directly downward (the holes are on the face of the hard hat), and any impact that could cause my modified hard hat to break would probably kill me, or at least break my neck. Regarding the voltage safety, a hard hat is not a reasonable device to protect you. The hard hat won't protect you from any stray voltage that could otherwise jump through a few drilled holes, or even just hit you in the face.
As far as safety is concerned, "there is no such thing as too safe" and their job will never be done. I understand where safety comes from, but at least in my case I REALLY wish that my work would require the safety people be actually knowledgeable!!