You should be able to reset your account to negate all your keys and set things back up if you lost access to all previous devices. I ended up doing this anywa

You should be able to reset your account to negate all your keys and set things back up if you lost access to all previous devices. I ended up doing this anyway in the end, after deleting everything I could before I stopped using it. They do make you wait seven days before you can do it after you make the request. I still have the account because I don't want to lose access to my username (didn't delete it), but it's otherwise empty and unused with fresh keys that have no history with anything.