my suggestion to help the PM - EU agrees to set up a working group of technical experts as soon as WA passed to investigate and make recommendations on "technological and facilitative arrangements"
can include any experts nominated by the UK (so all the ERG's favourite experts) and reps from HMRC and Defra and Irish authorities + EU experts.
set a deadline to report by October 2019 so can be fed into the discussions on the long-run future relationship... and have it chaired by a neutral. Both sides agree to consider conclusions carefully as part of "best endeavours"
This would show that both sides prepared to devote time and effort to finding a way to avoid the backstop...
