Success.

The experiment worked, the Phoenix pot layer didn't even notice it had been severed from the parent plant. No wilting, sulking or difference in growth whatsoever so we can assume there are more than sufficient growth to sustain all the top growth it has grown throughout the season.

I moved the top growth of pot layer away from the fence as it was shading some of the ripening grapes and interfering with the Merzling vine that is planted close by. The pot itself is still in the original position so the roots are undisturbed.