jura2, for Britain to remain in the free trade area and customs union without being a full member of the EU, then this country would have to gain at least "associate member status." The foregoing would resolve the Irish border issue but would bring forward once again the problem of free movement of labour.
However, an associated member status granted to Britain would enable negotiations to take place on free movement without transgressing the EU treaties so that problem would not be insolvable as it is now.
The downside of the above would be that the United Kingdom would without a doubt still have to make contributions to the EU budget, but we would leave the European Union and that action would uphold the result of the refurendum which leavers are demanding.
So, Jura2 the above is (in my humble opinion) the full problem and how I view the resolve of it. However, you express no view yourself on how to resolve the matter, other than Britain should not leave the EU.
In the above, do you really believe Jura2 that should any authoritative body just state that the United Kingdom was no longer upholding the result of the referendum and would now just remain as a full member of the EU, then those who voted leave would just sit back and accept that?
Should you wish to witness widespread disorder in the streets, action such as the above would be a sure way to bring that about.
So continue to bang your head on the proverbial brick wall if you must jura2, but you will have to come up with something better than you have put forward up to now to enable you to stop that.
Anyway, I am back in the office this morning and have been away for nearly a week I expect things to have piled up, so see you later, (probably much later). ?