Not all airplanes have autoland. I'm not sure what would be more difficult...teaching an PPL to land via radio, or teaching him to use the AFCS/Autoland.

It would probably be safer to just vector the plane to the widest, longest strip within range, and then let the guy land and pray.

In fact, I'm not sure a PPL could even figure out how to use the radio on some airliners.

If I were minus the other pilot, I would probably use a flight attendant before I asked for PPL's. I can't think of any reason that I couldn't fly the airplane solo.