DH
None of this stops a changeover of control later on.
As long as he/she is coping I'd be inclined to leave the P2 handling the aircraft at least intially for all the reasons you've mentioned.
I must admit that I'd be very inclined to insist on doing the landing, if only so that if it all does go slightly wrong and the aircraft goes off the side or end then it's solely down to me and I can carry the can/shoulder the blame (with the authority goes the responsibility, though perhaps that's an old fashioned way of thinking
).