I agree - a factory re-set in the SD variant of scanners doesn't exist like it did with the non-SD scanners.
Rather, I would carefully look at all of the Favorites Lists in Sentinel to see whether any of them can be deleted or modified. That said, I found out the hard way once you delete a Favorites List, it is gone forever. So you might consider creating or exporting a Favorites List to an HPE file before deleting the Favorites List. That is a way of recovering if worst come to worst.
I'm assuming by "removing a Quick Key", you are really wanting to remove the Favorites List that is associated with a Quick Key. Just clearing a Quick Key won't delete any data within the Favorites List.