Shown here is a concerned citizen with his eye, ear and, cranial protection.
Clint Smith did a write up a while back about a lil ballistic shield that had a flashlight mounted through it. I couldn't tell you who made it. Sorry.
As far as putting on a helmet goes... A 165gr Gold Dot to the head will result in severe injury and sometimes death. I am reaching for my Gold Dot dispenser before I worry about a helmet.
I guess it isn't a bad Idea but I sure can't take it seriously. The cops will laugh at you when they get there too but you will be the one with the unbroken head.