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Fill the head stamp with solder maybe? Possibly tig braze the other set? May over heat the brass but an experienced welder would know how to avoid that
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I would not do that, far to thin.
Scratching caliber in the side of brass is beyond iffy (stress crack point)
At this point you might as well ID it and save the fuss (and better not to anyway)
You might be able to make marks with an electric pen on the base, straight line (one line batch one, two lines batch 2 etc) vs any id.