So it would a "Credit ID," Passport Number, DL #, or something related. What's the difference, it will need to be stored next all your stuff, awaiting to be stolen. Now the banks eat the small % caused by fraud (cost of doing biz), your life is hell, but not theirs.
Scan your iris before getting the new loan isn't going to happen either, too costly and slow. If they ever do that online, they'll find a way to recreate that based on your existing scan, stored at the future Experian.