Lot of interesting and creative talk here, but I do know RCA's in Norwegian can not log a single hour as PIC! You can have discussions if its right or wrong, but as an RCA you are just looking after the aircraft for the Captain and can't log it as PIC. It simply is fraude if you do as Norwegian doesn't let RCA's log their time in the captains seat as PIC. Being RCA is nothing more than a sort of senior FO in Norwegian.
Could an FO otherwise also log PIC time when the captain is in the toilet during flight with a two man crew? Right......