Oh, that would make sense. Never seen it spelled or abbreviated that way.
If my wife were to want to become a pinch hitter (something I want but she doesn't), I'd grab a CFI that I know and trust to do it right. Gotta be sure that he knows that pinch hitting doesn't mean pinching her butt and hitting on her.
Our experience is that there's more need for thought than just getting a good CFI and trusting. My wife took PH ground school and flight lessons with easily the best instructor that I have ever used. Thorough, prepared for every lesson, clear and precise communicator, even tempered and positive, etc. The problem was that he treated PH lessons as he would soloing a PPL candidate (with some minor exceptions). After learning to control the airplane she spent hours flying normal rectangular patterns around our nontowered field. But that means learning to visualize descent through 2, 90 degree turns over relatively short distances and then quickly getting aligned with the runway to land. Not easy. And not necessary.
Instead, IMO, PH flight training should focus on three things. Controlling and navigating the airplane in cruise, shallow descents, shallow climbs, and shallow turns; radio skills; and safe (if not damage-free) landings to long (probably tower controlled) runways via long straight in approaches. For example, learning 3 power settings (climb, level, and descent/approach), not the theory of throttle and crab adjustments to compensate for different crosswind, downwind, and headwind components in a rectangular pattern. The former is much easier to learn and maintain than the latter.
In the event of pilot incapacitation the PH flying needs to be comfortable tuning the radio, talking to ATC to declare an emergency, following ATC directions to a suitable airport, lining up with the runway (starting with vectors and then being able to recognize the runway), and controlling descent at a reasonable airspeed such that the touchdown zone stays close to immobile in the windscreen (a stabilized approach). If they can do that, then flaring is much easier, and, truth be told, probably less critical as the objective is not to save the plane but only save the occupants.
So this was my long winded way to say that it is important to find an instructor who is willing to treat PH instruction as something different than instructing for the solo. And thoughtful enough to recognize the differences.
