The “a year” bit is semantics. If you are not already au fait with it, Google what conformity assessment means and you’ll understand how delays and costs will spiral.
From a man who allegedly runs companies you seem to suggest an unnerving ignorance towards understand the fine balances and systems busines rely upon to function cost effectively. If it was as easy as that then wouldn’t it be super! But it isn’t, what will be cheaper is to close down UK operations and move production within the single market/back to Japan now the FTA has been agreed.
And yes, this discussion regarding an MRA on Conformity assessment will not be relevant in the case of a deal being agreed but we are specifically discussing a no deal scenario and, as per usual, this is a massive issue conveniently forgotten by those advocating it.