Plain Lead is harmless. It is the fumes/vapors/smoke of working a Lead Melt that is a source of Lead Exposure...also, the Chalky, White substance (Lead Oxide) that forms on Aging Lead Parts is where the risk of Lead Poison is. One ill-effect I've seen, many times, is unpainted Lead Parts that are Oxidizing, turn their plastic bag into crumbling plastic "ashes", turns it into flakes.
Has there been any thought put into a simple, low-cost, maybe even Environmentally-friendly coating that will prevent/stop Lead Oxidation? How about an additive that is mixed into the Lead Melt that would achieve it, instead of a coating? When I say "coating", I mean a liquid that doesn't (solely) need to be applied to the parts Individually, but rather can be added to a small lot of parts and tossed/rolled to coat. For the additive option, maybe an idea similar to how Stainless Steel is made...Stainless Lead?
Do-It would surely be the Pioneers, yet again. We have liquid paints, yes, but this should be different. Achieving this would reduce exposure, tremendously.
Side Note...I like the idea of an additive, myself, as long as it doesn't cost a Long Ton.