Has you can see, the Hammerhand is very close to the Warhammer and could in a way replace it.
After all, the game is considered apocryphal and is a sort of "alternate reality", since we can't have Harmony Gold mech.
Why not using very close design. (The Hammerhand was actually one of the design who made the warhammer possible in the lore.)
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In MW:O we could still have Warhammer in working order. And with a little redeisgn, get a Warhammer, but only the name could be different. Thus, not really problem for the lawsuit against the name.
Just an idea, but I want to know if you have considered this.