They could possibly use Superman's newest villain if the comic is popular.
Originally Posted by Blackman
2) There response for Superman being here to stay is that some, like Lex, dont trust him. So Lex tries to build something to combat him or stop him in case he goes like Metallo or something of that sort
I think first LexCorp would build a kind of machine based army for the military, perhaps something like the Omac project, and then it escalates to being merged in secret with a human experiment which is where Metallo comes in as Lex's pawn against Superman but with his own agenda that makes it harder for Luthor to control him than he had bargained for.
Of course the latter part rests on how they work Kryptonite into the story and more importantly how Lex discovers that it's harmful to Superman.