I like a lot your desing and I wish similar things for Samurai in the game. But, knowing Square Enix,we will have...

http://i.imgur.com/0y6R1.png

or

http://vignette2.wikia.nocookie.net/...20110417153755

or

https://ffxistyle.files.wordpress.co.../elv_sam_3.jpg

If not, look at the "Ninja" weapons. Only 1 looks like actual kodachis. I know the katanas doesn't have the flexibility on desing like other weapons, but we will have a lot of weird stuff instead of katanas.