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Hexblades should bind vestiges. Make it a more explicitly martial version of a binder.
Just replace their entire HD / BAB / saves / skill points / spell progression chasis with the Duskblade's. Then give them appropriate spells for their list (icluding some at a level discount; they only get up to 5th level remember). Other class features can be buffed to what the class creator suggested and still probably be on par with what duskblade's other class features are.Do you want help picking spells? I suggest they basically get all curse spells, and generally at a level lower than normal. Otto's Irresistable Dance as a 5th level spell should be fine. And well...spell list will require some work.