But you were wrong, that is why I told you about bases. I appreciate your techniques, you obviously have experience, but some things you say don't seem to always make a whole lot of sense.
A base grind can be done on any ski, what you going on about? If you, or the shop you bring them to knows what they are doing there will be no problem. I heard you talk poorly of them, but if done correctly it will be fine. You also have to remember that we are talking about park skis, your 1/10th of a second isn't going to matter. A base high ski might sound ideal, but you still need to carve. I'd prefer flat, but to each his own.
Just tell the kid to buy a 10 cent sheet of sandpaper and be done with it (because really it is all you need for a detune to work). No need to be fancy.