Or if you really want to change the items along with it, you could cut down the work by letting 1-58 stay as it is and from starting at 64 and forth you will have a claw( that way you only need to change heart breaker and on in inventory... )
Pros:
- Grapple wouldn't be the only weapon without a visual anymore
- Makes grapple less boring
- Would look badass
- Would even make sense
Cons:
- Maybe some gauntlets in inventory would need new looks and renaming, but that is not neccessary.
Here is a picture show of what they could possibly look like (Credits to LadyPhoenix for the picture):