I honestly think you are mistaken in the belief that they are that bothered if we have a hard Brexit and we had no cards (other than veto & a50 from the outset) I don't expect I can change your mind so will leave it there.
What I do predict is we will agree an exit bill with at least 30bn binding regardless of the trade deal.
Your point about veto is a good one. It really was one of our few cards... does us triggering article 50 mean we can't use It? Is article 50 binding?