JB Kwik Weld seems to hold well to the safety paddles when they are prepped well (Sanded down with 120 grit and cleaned with Denatured Alcohol). Color is a dark grey with a touch of brown, but it's somewhat close color wise. The problem I ran in to is that it is very runny at first, so it runs everywhere and you need to constantly play with it. I am trying to figure out how to dam it up more so it doesn't run everywhere. I want to apply it when it is runny for the best adhesion. I have one safety with a large shelf on it that runs thru the middle (height wise) of the safety that I need to sand down and clean up, maybe pics tonight? Seems to work, but I am going to try a shelf on the bottom of the safety next to see which I prefer.
The Epoxy PC stuff may work where you can shape it more before applying it? I have an allergy to epoxies, so I am trying to be careful and limit my exposure to them. Another person used dental acrylic and painted it; the raw materials are available online thru costume/makeup/special effects places since they use it a lot in theater, film, tv, etc.
I think the best would be to slit the safety, install a thin metal or plastic shelf and then epoxy over the entire shelf so it is completely enclosed by the epoxy. The Epoxy seems rigid enough, but the metal/plastic shelf would allow the use of less epoxy, especially on the top side and the bottom can be made thicker to support the shelf.