It’s don’t think Boris is going to settle for anything short of a total, no strings attached withdrawal. He doesn’t have to negotiate anything with anyone. IMHO.
If he wants a no deal Brexit, all he has to do is repeal the Benn Act tying his hands and let January 31 come and go.
His enemies can’t stop him; only a backbencher Tory rebellion could kill it, which is highly unlikely.
Brexit for better or worse, is now inevitable.