Let the Klingons take him out
Zero’s modus operandi is to find the blackmailables and persuade them into his fundamental transforming. The un-blackmailables he doesn’t want, he just has their records unsealed and then personally destroys them. He promised nobody would ever be prosecuted for any crime ever in America again.
Quite a few believed him, and cleaved to him, and came out of whatever deviant closet they lived in.
Just make him look like one huge Tribble.