DESFiRE changeable UID

Yes there are such chips, no they’re not available as implants.
AFAIK they are really rare and expensive and not too many people would need one.

If you own the system you should be able to enroll your own chips, so a flexDF2 should work.

Actually they can even have a random UID every time you read it, the auth is done with crypto on the chip, not the ID.

What system do you have?

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