pinch harmonics on classical?
I've never tried, but I'm basically positive they wouldn't work. You need a high amount of gain and electronic pickups to pick up the harmonic tones after you catch the string and amplify them.
It is possible
yes, but they're not loud enough to be of any use, unless you use a mic or something that can pick them up, but i haven't come across any.
It's possible but they come out very very quiet.
possible, but not audible. i attempted this many times during guitar class at my school, which was a waste of time.