Even though its miserable, and as much as you want it gone, i would not ever turn a motorcycle because i wanted to reduce heat in its exhaust. I picture you in heavy traffic, and im sire its horrible, but Its not a great goal to have in mind. You still get heat with an aftermarket exhaust and the best reflash. Its less, way less, but i cant say its ever pleasant.
I would try the kit because it will probably make your bike run better. Making it extra rich, im not so sure about. By definition, thats more fuel than you are burning. If you lower engine temps, this way, be prepared for the problems this causes like carbon build up, horrible mileage, and probably things we have not even though of.