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Maybe you could mix silver paint with the epoxy?

At least you tried :-)

Here’s a mad idea, have a look into JB Weld, a metallic epoxy resin, you could fit shoulderless spring bars then fill the drilled lug holds with it, this would hold the bar in place and when dried...

I had a small laser weld job done on a bracelet some years ago by a Watford based jewellers:

https://forum.tz-uk.com/showthread.php?374775-Bracelet-repair-results&highlight=laser+welding