Fencer
Why yes, I am a Smart ASS
Take Skyways slider (since the deminsions are known and it is made from solid alum to clamp better and not crush) fabricate a clamp to go over the slider, (makes it removable) with two or more set screws to hold the clamp in position. I would suggest a clamp 1 3/4' to 2 1/4' wide. Have a small piece of 3/8 or so round stock extend from the clamp to the outside of the slider. Hinge it to another piece of molded alum with a contour spot for the back of your leg/ ankle depending on how tall the rider is. Folds out of the way when not in use, you should never have to worry about it draggin, and offers a really stretched out and DIFFerent position for your leg/knee/foot over the currently offered highway pegs for the FJR.
If I were only a machinist.....
I know, I'm not even an artist, but you get the idea.