I can't tell you anything about the KP belt but on my XR measuring from the outside edge of 1 tooth to the outside edge of a 3rd tooth is 27mm. This logic eliminates 2 teeth so if I were looking for a shorter belt I would look for 1 with the same spaceing. This should pull your rear axle 13.5mm forward.
Retired USAF, IYAAYAS!
2008 V-Star 1100 Custom Bobber project
2011 Crimson XR with Forged Highway Bars / Hard Bags / Passenger Backrest, Ness parts including Smooth Layback Plate Frame/Mount / Rad 3 Mirror / deep cut grips / drivers floorboards /shifter peg / brake peg / passenger pegs. Witchdoctor black rack, Lloydz filter / timing wheel / VFC III, 7Jurock windshield, Drag Specialties seat.