I think I may go with lead and powder paint. _I'll have to cut a mold for them in order to use lead. The only issue I can see white powder painting the inserts is how I would hold onto them while dipping in the paint. I powder paint all my jigs, but I just hang them on a rack by their hook to bake when I'm done. With these inserts, there's no "tag end" so I am working on my fourth(ish)

cup of coffee here and hoping I'll come up with a good plan.
Here's a picture of the inserts I am using, along with the rod that sits in the mold to keep them exactly where I want them:

The only thing I can think of would be to find a whole bunch of rods the same width as the insert rod, and stick them in the weight when I powder paint, then put back on the regular insert stick it in and pour...If I do a bunch at once it may be worth it. Just not sure...