I don't see why it wouldn't work, but you'll want 250 or 300 mg assuming roughly double the potency of oral dosage, and so if it burns anywhere near as badly as most other phenethylamines you'll be in for a world of hurt. Not to mention if it's extracted there may be quite a bit of left over plant matter which will turn into cactus snot, overflow the volume of your nasal cavities, and keep the alkaloids from coming into contact with the nasal tissues (I'd almost pay to see someone try snorting impure cactus extract because I imagine it would be a hilarious sight). Personally I'd put a small amount in a small volume of water and see if it dissolves cleanly first. I don't know what other chemicals were used in the extraction, but you might also want to test the pH of the resulting solution to see if there's any surplus acids or bases left in the extract. If all is well then skip the insufflation and plug that shit.