Yeah, what a palava!
What are they like up north.
With respect, the Irish Sea option is a backstop solution, to the Brexit problem.
A vote on this issue is not an alternative or a logical next step in the evolution of the GFA. Since you earlier used the expression 'explosive' in talking about NI, intentionally I'd guess, let me say that forcing a referendum on Irish Unity which is what you seem to be suggesting as part of a Brexit, is akin to putting a gun against the heads of the NI people and asking, do you want to come with us in the UK or go with Ireland in the EU.
They've already said they would like to remain in the EU. Unfortunately nobody pointed out the two are mutually exclusive, following your train of thought.
The natural evolution of the GFA and a solution to the NI/Brexit problem are not the same thing and to to be forced to make them so is my definition of weaponising the issue.
I would suggest that it is not that straight forward and if you think it is, then I would like to see meat put on the bones of your original response to Alex above.