I think you are right Richard, after all, that is probably how Porsche would do it if the original unit had failed like mine and they had to set-up a brand new unit.
But you know me, (I used to be a project manager), I will always opt for the plan that has a greater certainty of success ...... I can't help myself, it's how I was trained 🙂
Thanks again for all your support
cheers
Tony