I hope that wouldn't be allowed to happen any more than if the tea lady (not qualified on type)" fancied a spin". To answer your question, allowing an unqualified person to attempt an approach demonstrates poor captaincy so yes he gets carpeted!
But the tea lady probably isnīt CAS. Is it written in bold somewhere that the designated Captain can deny a VSOīs "request for a spin"?
I would hope so, if not then CAS should accept responsability.