Miles did, but since neither the paranoid Wax nor the also-a-Bloodmaker Wayne mentioned having implanted Metalminds, I assume there's nothing generally known which is safe for even a very hardy individual.
-- Deus Ex Biotica
Darn. However, in our day and age (when the next Mistborn trilogy is set), we have implanted screws and stuff all over the place. So they'll probably do more implants as surgical techniques get better.