Modelling the hands is one thing - but animating the swing of a melee weapon or the reload of a gun is a complete different thing.
If you want modellers to be interested you should at least include a bunch of swing/slash animations - best with the hands allready gripping a handle.
Then everybody who can design a sword, axe or crow bar would be more than willing to invest in your hands.
But honestly I dont anyone think anyone should sell his rights for
reselling a model - at least not for some hundred store points
In case you find my grammar and spelling weird ---> native German speaker ^^