Very good RCTURKA; anything that helps repeatability is a winner. I really like adjustable clamp <1mm to >20mm thickness. Getting good miters off a scribed line is proof, good clamping, accurate marks = 90°

Mere suggestion; I'd tend having that fence pinned with removable dowels for both 22.5° and 45°, and a moveable stop bar for right side, but all of your concept is perfect.