I posted something similar in the Customcade thread, asking about the use of screw buttons with one of these templates. After posting, I realized that the buttons that appear to be closer (like 33mm) are actually near 36mm center-to-center.
You have to calculate the center to center spacing of the inclined buttons using a triangle and the Pythagorean theorem (c= a+b). So for the Vewlix template they have, taking the first two buttons on the lower row, you’d have:
So if the layout’s cut is good, at least you could use some Seimitsu buttons which are 35mm, or mix and match.