I have, and it’s not even DIY:
- The Yale Doorman V2N lock on my front door uses sectors 0 → 6 on my Mifare Classic 1k implant
- The Rohos Logon Key software on my work PC uses sector 10 on the same implant. That works because it’s cleverly configurable to exploit unused sectors.
- and of course, most other toys / software I interact with using that chip use sector 0 (UID)