Don't know how you can do "pinch" harmonics without a pick and especially distortion.
If you simply mean right hand harmonics, I don't think playing a scale that was is ALL that hard assuming you're looking at the fingerboard, though doing it FAST might be. (I just picked up the guitar and did it. . .if I can. . .you can).
This isn't classical, and he's more than your average guitarist, but here's some good harmonic playing by Tommy Emmanuel.