There is a standard “pinch hitters” course that some flight schools will hold. I had my wife take the course. It’s a 4 hour ground school course and a 1 hour flight lesson.
The purpose of the course is not how to land the plane, but to get familiar with the controls and maintain upright position AND get help on the radio.
The idea of the course is to get an already bad day become a little better of a day by seeing the light of day when meeting terra firma. In otherwords, save your skin, plane is replaceable.
My wife has about 150 hours “right seat time” and has no real interest on learning how to pilot an airplane.
She knows how to maintain straight and level, and turns in VMC. (IMC all bets are off)
She knows how to talk on the radio (in plain English), she knows how to read the GPS and knows how to change the frequency on the Garmin 430. She knows how to change the transponder to the emergency squawk IF I am not on an IFR plan.
Since she generally flies with me IFR transponder is a moot point since we are squawking and changing frequency is a moot point since I am talking. I told her just get on the radio and call for help. Not even worry about the mayday call, plain English will get her help.
Bottom line, could she land the plane? By hook or crook she will land.
The object is to land with the minimal amout of energy as I doubt she would even make the runway. My hope would be for her to make it to the airport environment.
She could fly the plane to the destination airport as case may have it, incompacitation probably won’t happen convienantly next to the departure or destination airport. I have not taught her how to put in an airport code (something I NEED to consider showing her!) should the need to divert is there. Garmin 430 not user friendly in that respect without going through many menus.