I agree with you, but the time for fudge has passed. That was the sole purpose of the eu "backstop" statement.
The wisest course of action , and in my opinion the more honourable whould be to declare this circle cannot be squared, and state " look I know it's not what you voted for , but now that the costs and operating parameters are becoming clearer, do you really want to go through with it , i am proposing a free vote in parliament, for having an another referendum and come hell or high water we will abide by that wish. "