Glad to hear that you are making progress.
I still like the idea of threading the screws partially into a lead plate. The plate doesn't have to be thick, maybe 0.7 - 1 mm thick. Since they are screws, there has to be some portion of the thread that won't show. The plate is no larger than what you need for your batch of screws. Since the lead is so soft, just punching holes in the lead plate should work.
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