I think combining tori and uke would be better. I would rather have a mod that works spectacularly in sp and not in mp than a mod that is just ok in both. Having an elbow to use would help a lot with real-life pen-spinning techniques as well. I truly believe that pretty much anything is do-able in toribash.

A mod like this would require lots of time and dedication with multiple stages of development, that's why I am offering a large tc reward to the person (or persons) who can pull this off.