While standard body armor may not be the best way to go, some type of protective equipment stored in the safe room is good food for thought, we keep life jackets on boats right. Just the designation and a reinforced door do not make a "safe room"Every situation whether boating or working, even Bicycling has some type of safety equipment.
Due to legal, size, and convenience considerations, "vests" per se may not work, but lets examine the possibilities for maximizing the protection offered by your "home sanctuary".