Recall the old joke? "The sciences may be able to tell you how to clone a dinosaur, but the humanities will tell you why it's a bad idea."
A number of ADV guys buy X Challenges then go on to change the suspension and sub-frame, add ammo can panniers, windshields, comfortable seats, and finally drop a grand on the ugliest fuel tank ever made. When they are done they have an adventure bike that is only half as good as a stock F650GS at twice the price. It seems that purpose built starts with a blank sheet of paper rather than an accessory catalog. Blame John Penton.
The rough thing about knobs on a Duke is that there are several other KTMs that will be faster and more fun on gravel or off road. And with the wrong tires the Duke is never going to perform the way it was meant to on pavement.
Some of these new standard designs are pretty cool looking and tricking them out to look like old desert sleds or cafe bikes is a fun novelty. Perfect for runs around town and car shows. Did I say novelty?