Sensible people will call security on you and you're probably going to get arrested, and rightly so.
You may find a "mark" but you'd be placing a naive and people-pleasing person in a very bad and nerve-wracking predicament. Drug cartels have been known to smuggle drugs in very unusual places (sown inside dogs, in the texture of Virgin Mary statuettes, watermelons) and I doubt they haven't considered doing exactly what you're saying.
So no, don't do it, don't put someone in that situation. Mail your knife or replace it, consider it part of the cost of the trip. Or just check in your own bag.