Genji or Gauntlet specific weapons

The character I have replacing Locke does not use shields. He either duel-wields or uses 2 hands for 1 weapon. Here's the thing. I don't want him to be able to hold one of his duel-wield weapons with 2 hands, nor on of is 2 handed weapons with another weapon in hand. Does that make sense?

I want 2 handers that can only be used by themselves, and one handers that can't be held with 2 hands. How do I do this? Is it possible?