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Maybe I'm missing something, but I don't think pressure from DC is really relevant in this case.
Well, it's obviously only a suspicion at the moment, but I'd assume the only way in which Johnson could get enough pressure (apart from that caused by the general chaos and shitshow he's created) would be from the president-elect, who I'd assume looks askance at Putin's subversion of the UK.
Maybe I'm missing something, but I don't think pressure from DC is really relevant in this case. It would take political will on the part of London (and agreement from Brussels, which eventually we won't be able to rely on). I don't believe that an extension is impossible, but I think a deal with more transition time (probably called something else) is more likely. I hope so, anyway.