also have a look at these threads:
https://forum.ih8mud.com/threads/lexus-credit-card-key-successfully-programmed-on-2016-lc-89904-53512.1164849/
https://forum.ih8mud.com/threads/credit-card-key-for-land-cruiser-lx570.1212321/
i can vouch for this seller: Unlock SERVICE For Lexus Smart Card Proximity Remote HYQ14CBB HYQ14ABB HYQ14AEB | eBay - https://www.ebay.com/itm/401474922353
they unlocked my gx460 credit card key that i programmed to another lexus