It's worth noting that black marker rubs off duct tape with VERY little effort whatsoever. You can do it with your finger, and anything abrasive is even faster, regardless of whether the tape stays attached. Masking tape keeps the marking permanently, but the tape itself is weak and will come off at some point.

Honestly, what we're talking about here is $5 in decals to ensure your healthcare is not compromised from something as simple as the medics not being able to find your info. Just buy an extra set, surely your life is worth that much.