Yep so no mention of touching the controls.
There is no function of control manipulator.
There is though of PIC. The PIC is the PIC even if someone else is touching the controls.
It will take a court case to sort out what the law really means. But the precedence of CAA briefing material stating to get the pax to fly if they feel airsick and also to keep partners current if they have done the safety pilot course. Would come into play.
Now the EASA stuff has come into play things may have changed.
But to be honest the banning of none pilots having a go wouldn't have any effect at all on the safety statistics.