I love the idea of having a samurai-type weapon for the pyro, since I personally think he also should have one given some of his cosmetics have samurai looks. However, I think the blade length might be too long. With that said, I think perhaps maybe you could offer a style like some weapons have, with one being the pictured blade length, and the other style being much shorter. A good example of the other might possibly be the Naginata, which has a very far reach but a short blade length: http://casiberia.com/product/naginata/sh1020

Or you could make another item that is the Naginata, I personally think that is more close to a samurai looking weapon.