The only way Farage could become PM is if he is leader of a political party that has a majority(or is the first to form a coalition) in the House of Commons. The Brexit party would need to go from none to about 250 MPs, pinching those from both Labour and the Conservatives, to manage that.
These are extraordinary times and I think this could happen. If not they certainly could become the 'Kingmakers'.
While I wouldn't rule anything out, I think Kingmakers is the likely scenario of the two. I mean, who would have believed you 5yrs ago if you said the DUP would hold the whip hand in Westminster
Daft food treatment processes aside, whoever is in No.10 after Brexit will be under massive pressure to do a deal, any deal with the US, because they will have just delivered Brexit and now have the singular goal of showing the plebs it's been a success.
In the trade negotiations, we would already be the weaker party being about 1/6th the size of their economy, added domestic pressure and a president whose whole administration is built on MAGA ensures we're going to be royally screwed over. Exactly as the majority voted for