This is fascinating, thank you! I just want to pitch in that the "tradition" of silver being harmful to werewolves is entirely a Hollywood invention. There's little to no evidence of it before the 1941 Wolfman film, and elements from earlier folklore appear to have been introduced retroactively. Personally I always felt that, given silver's links to the moon, it would be more likely to have a positive effect on werewolves than negative. I haven't found a way to work that into my own fiction yet, but I will one of these days!