Are you refering to shirasaya? Shirasaya are essentially blades that haven't been formally mounted. They are temporarily housed in a very plain wooden saya and fitted with a simple wooden handle (with no guard). I have always thought they looked cool, but they aren't meant to be used in this state. Shirasaya are simply a means of storing a blade until it can be fitted properly. Yes, Bugei can fit blades in shirasaya.

If you are refering to "sword canes" like the one that the TV character Zatoichi carries, then no, I don't think Bugei offers one (though you could probably talk them into making one as a custom order if you were willing to fork out between $3000-$5000).

An interesting point: I've read that it takes about 15 years of dedicated training in Japan to become officially certified to professionally fit blades. Obviously, this process takes place after a blade has been forged/folded and finished. The making of a "real" katana is truly an amazing process, and the result a remarkable work of art--"soul of the samurai," etc.