To be honest I never read more of your post than "A Samurai...".
My bad.
You could change the animation that is used to draw the weapon in the module system, I guess. Use a normal 2handed weapon as reference.
Also what about the OSP swords pack? Is there a katana in there or am I mistaken?
And there was a far-east mod for some older M&B Version where you should be able to salvage a weapon. Asking for permission before you sue it and so on.
Or
this is bound to have a weapon like that as well, I guess.