That a perfectly good solution ich. The border is open to traffic so tick in that box: and if the EU feels they need to insist on checks because they don't have sufficient trust in a nation it's tried to punish then it can do whatever checks it wants and many and varied as it likes, at "it's" citizens' business premises. And take responsibility for the hassle they, themselves, cause.
It's too decent a fix for that part of May's capitulation for the EU to want to accept it. It'd mean no longer pretending the UK is responsible for the problems that the EU decisions create.
Meanwhile I look forward to independent qualified eyes explaining the gist of it all.