He won't. Tell him I said to do it that way if he gives you any grief. He's a very good buddy of mine, and an absolute top notch guy!
FYI - Almost all bar clamps use pretty similar spacing on bikes of this model. They may be off slightly here or there. But you could essentially have a "lower riser" milled to receive the upper, then it uses a single stud to pass through the upper tree with a single hole, bolted from below. This would be less expensive for you (less milling, less material) and far easier to locate the bar clamps exactly where you want.
You're essentially making a "riser" that is drilled for your stock bar clamp, right? Depending upon the style of top tree you have made, you need to verify tank clearance, and gauge fitment. With a separate bar riser/clamp, you can position the bars slightly more forward to clear the tank, create visibility to your gauges, etc... If everything but the top tree is stock, then its pretty simple really to replicate with a new billet tree. But be mindful about where the forks pinch, and the clearance on the tank from the underside of the top tree. Billet will be much thicker, and you don't want to rub your tank
