Many locations have a "Bring Your Daughter To Work Day" or a "Bring Your Son To Work Day" each year... why don't you organize a "Bring Your Handgun To Work Day"? Hand out NRA stickers and ballooons?
That'd be the proverbial turd in the punchbowl.
I spent more than a decade at a very large semi-conductor company. A part of my job was to interface with the legal department and I became good friends with our lead counsel. We had similar interests - shooting. He was also a reserve deputy and an qualified armorer for one of his local police agencies, had an FFL and would handle ordering firearms for me when I wanted one. We had and have a good relationship, we still hunt elk together yearly tho we're both retired. The company had a zero tolerance toward firearms. I asked him about it and he stated in absolute terms that if they ever terminated anyone he knew over a gun in their car he would personally find legal representation for the employee. They never did terminate anyone in the 12 years I worked there for a gun in the car - and I personally know of one instance where they searched an employees car and found a handgun, after a threat had been made. This person wasn't terminated but was put on leave for awhile.