The more I think about it the more I think he can't survive this.
He simply won't be able to get anything through parliament, they will vote always against him. He's already 43 short of a majority. Now they all hate him.
He is properly fucked. He either has to resign or they will vote no confidence. But only after the extension request. He won't now try to get round the law on the extension, he knows the courts will find against him and the Supreme Court will send someone to get it.
Maybe he will seek the extension then they vote no confidence. Even if he got a deal, the house won't pass it.
I really think it's game over for Boris.