you do of course hold a valid licence, and a valid class rating so you are fully entitled to act as a pilot.
But not valid to carry passengers because that requires 90 currency.
Being PIC does not stop by handing over control.
No, but the pilot flying must have an operating capacity. It can't be dual unless the other pilot is an instructor. It could be P1, but that would legally render the other pilot a passenger because its a single pilot aircraft. Art 255
50% of the time an airline captain is PIC without having personal hands-on control of the aircraft.
Yes, but that is in an aircraft certified for two pilots which brings P2 into the equation.
The only options have been stated quite clearly at the beginning of this thread.