Hmmm... I could probably do something like this if you want... It won't take long... I will just need the meshes of this sword.
One way you could do this is my simply creating a new one-handed blade in the CS, and add the mesh of whatever it is you want it to look like... So technically, you could have a huge War-Hammer that swings at the speed of a dagger, and vice-versa.
PM me to tell me more details.
Cheers,
gman021