Your grind would be .32 inches high to form a 22.5 degree zero edge on a Puuko style blade according to this calculator:
http://www.calculator.net/triangle-c...its=d&x=71&y=9
That grind is ridiculously short, of course. I've made knives for 20 years and have talked to a lot of knife makers and never met one who bothered to calculate any type of edge geometry except as a curiosity. It really is a waste of time unless you're trying to program a CNC machine. 22.5 degrees is sort of silly anyway as you won't be able to get that half degree anyway, lucky to get within one degree. Not that it matters, you'd never notice the difference when cutting with a 21 degree edge compared to a 22.5 degree edge.
Just grind it until it looks good to you and then test it. You'll have an edge that is less than 22 degrees and it will cut better and be as durable as most zero grinds ....