Rob, fear not. If I was sledging you, you would not need to guess

Just ask Kaptin M or AirNoServices, etc!
No ridicule intended.
Perhaps it would be better for me to say, that a healthy skepticism is a good quality in a pro pilot.
We are in an occupation where we are playing with our own life and that of passengers. Technique not in flight manual? Not necessarily wrong, but be suspicious.
In this instance, I think you should get back to your instructor and get him to show concrete facts to support the technique he is teaching.
Imagine yourself in a court of enquiry one day. One or more judges running the show. A $2000/hr lawyer asking you 'And this technique, Capt Rob, which technical document did you base it on...?
Like I said, no ridicule intended.
Another thing that bothers me --
but it's a technique which I will leave as the last resort
Unless you are being pursued by crazed Moro tribesmen that are going to feed you your own scrotum, then kill you, I can't think of a suitable time to use a 'last resort' takeoff technique.
Maybe i have misunderstood your choice of words, but sometimes, you just don't launch. Thats the job. When to go, when to wait, when to try another angle, when to dig your heels in and say "No, not today, not on my licence."
For your own benefit, get an exact understanding of what this technique means in terms of TOD, TOR, Vs, Vmca, time spent accelerating to Vyse, RoC, EFATO considerations, the whole lot.
FWIW, good thread.