What do you think about the idea of having shaped arrowheads for your regular shots from a bow? They aren't equipped, they would be consumed like food giving you a buff that lasts 30 minutes applied to your weapon.
Serrated Edge - Your Light and Heavy Attacks with a Bow gain X amount of Armor Penetration.
Blunt Tip - Your Light and Heavy Attacks with a Bow have a chance to stun your target.
Poison Coat - Your Light and Heavy Attacks with a Bow have a chance to snare your target.
Powder Coat - Your Light and Heavy Attacks with a Bow have a chance to knock your target off balance.
Razor Hook - Your Light and Heavy Attacks with a Bow have a chance to cause your target to bleed X amount of damage over Y seconds.