I think that the situation would overload the majority of PPL's. I remember going from Warrior to Seneca and even with the benefit of prior knowledge and an instructor, I was all over the place initially.
I suspect that the scenario most likely to succeed would be for the PPL to use the radio, (they would probably be able to do that) and to be given and aircraft to follow who is instructing them and telling them what to do. Using the auto pilot in anything other than straight and level will overload. Set the power and follow the aircraft ahead who call the flaps etc. I still think that the chances of success are mimimal. There are just so many traps that a PPL can jump in to. If the power curve doesn't get you...flaring at your 'normal' 10 feet probably will.