The method sounds horribly complicated. Only whizz wheel I've ever had is the completely round one CR-something springs to mind.
With that, stick a dot on the disc for the wind direction, and that's the only drawing required. Rotate the disc to heading, it gives you the head/tail and cross components. rotate the outer disc to the airspeed, and read off the number of degrees against the knots. very doable in flight. Might be worth looking at as an easier solution.