Dark Souls Prepare to Die Edition- Special weapon attributes

[noxuary]

Is there an existing table that lets you apply special weapon attributes to weapons that normally wouldnt have it, like toxin, curse, egg head, etc?
I like to fuck around with and annoy invaders but often theyll just kill me with an instakill weapon and I have no way to fight back next time they invade. I also think it would be funny to use it on NPCs. I havent been able to find any relevant guides on how to do that.