Mifare 7 byte implant?

Does an implantable Mifare chip exist with support for 7 byte IDs? If yes, with writeable ID?

there’s the flexMN (it may be the flex MT i can’t remember) which is the mifare ultralight magic with the 7b changable UID

flexMN is also discontinued… there are cards that exist which are magic mifare 7 byte UID but I have no idea on capacitance or even if I have an antenna that might work with them. It would be a dngr.us/custom job