I think you can completely remove them by going to account management and saying your account password was stolen. Provide them with the correct information and they'll set a new password with no recoveries.
But many people lately have been saying that a mod has now confirmed that there is no way to remove them.
I think there isn't a way to remove them because I have tried so many things, but in the lobby it still says, Recoveries: SET. even though in account management it says i have none.