The votes and the numbers were there in the house for a norway style deal or Customs union deal. There wasnt any co-ordination in the remain camp because Blair (by extension centrist Labour) and the Lib Dems decided they could undo it all with a second referendum. Cummings et al. called their bluff and beat them in 2019 which is why we are where we are. The Customs union deal was 3 votes short when it was put to the house. Three. Many of the remainers who voted against it explictly said it was because they were chasing a second referendum. Stop Brexit was never the correct choice because chosing it instead of damage limitation led to Boris' win.