Sportsr gear shifter

Servus, I’m now driving an 2019 XL 1200C and I’m interested in shift flaps. I’ve already done a little research and had to find out that there are probably no finished kits for this, but they are mostly self-built. Is that true? Are there no finished solutions for this? What about a decrease? Simply remodeling won’t work, there are no test numbers on it for an own construction or it counts as if I just placed the current system differently, prakti don’t make any structural changes that need a decrease? Thank you very much