The thing is, Sand has a Fan for their Hidden Mastery, Mist has a Bubble Pipe for their Hidden Mastery, Leaf has Gentle Fist, so it would seem redundant to give them a weapon for a Mastery that doesnt use Weapons but rather their Fists.
That being said i would like to write a counter Idea!
Lets give each village a Specialty Weapon, Leafs could be Chakra Blades, Sands could be the Sand Gourd (Open to another idea), Mists could be something like a Kusarigama (Sickle and Chain)