It would be irrevocable, so you couldn’t be ordered to disable it during a border crossing.
I don’t get it. It can’t permanently disable your account. Is there a password to unlock - which border guards could demand? If it’s a time-lock all they have to do is lock you up until it expires. Think they won’t? Even if you can only unlock it when your metadata says you’re home, that can be spoofed, can’t it?