I'm apprehensive about doing that, since I somehow can't see club or hammer being used that gracefully; the feat was very much designed for slashing weapon builds. In any case, giving a [Style] feat as a bonus feat seems too restricting to me in terms of builds. What can be done to make a hammer-and-medium-shield style work alongside a graceful sword-style? Maybe a sword-and-board Combat Style tree is in order?

On the other hand, shields have never really fit the ranger paradigm...