I think the GATT thing has already been mentioned at one of the debates and hustings and the conclusion was it was not workable.
May's deal with the backstop dropped should get through parliament. It's not what we want, but we're not going to get what we want, unless as I said, the whole things collapses, an election happens and new blood enters the fray.
As I said in the no-deal thread, if some conservative MPs defect to the Lib Dems next week (one of them has already been deselected by the local conservative party, Phillip Lee) then that will collapse parliament and an election must then happen and we'll see if Boris does a deal with Farage. If he wants to stay in power, he may have little choice. And could the unthinkable happen, could we end up with Deputy PM Farage by early autumn??
I think it is workable, Horizon, provided that the EU play ball. We need their agreement to use Article 24 and the reason it is said that it is unworkable is that it's assumed the EU would reject the idea. However, that would hurt EU industries, so I would have thought they would be amenable to the idea if the Withdrawal Agreement is dead.