30mm has limited choices. The thick bars do look good, but I think only Guzzi makes them. Also, they do neck down to 7/8" or 22mm for the controls.
If you don't mind 7/8" bars (my loops have them, but I think they would look funny on my EVT), get a stock set of risers from a Tonti frame. Then you can chose just about any size bars that your cables will fit, or you can build your own cables to fit the bars.
Now which riser works with the stone, I'm not sure. Any help here????
Tom