Pity you're so far away Marty. I'm wanting to go the other way and bring my legs back about 4 or 5 inches, which is about where the Roadster peg position is.
My 07 standard pegs are probably a bit short of making the distance you're wanting to go to by the sound of it.
Mate, I run a small Engineering business and if I was in the same spot as you I'd be looking at welding on an extra set of mount pads onto the rail as far forward and on top of the bar as was practical.
Bang on a set of highway pegs and leave the standard linkages and pegs where they are.
I don't have much faith in the clamp on set ups. I reckon they'd have a tendancy to slip around on the bar, but I could be wrong.