It can be easily solved. EEA with a customs protocol and unilateral alignment to CET on goods. Not rocket science, you keep wetting the bed over this issue because you don't understand it well enough.
Meanwhile, Time to pay your way
https://www.ft.com/content/0a8799c6-1190-11e8-940e-08320fc2a277
Forgive me here, but that proposal would at a minimum require continued free movement of people. That’s a British red line issue. Taking back control!