I wouldn't mind going by inches measured from the hairline.
This is definitely the most accurate way. You can be short with a long neck or torso, or tall with a short neck and high waist. Actually, there was a thread that asked how many inches from your nape to bsl or wl or something like that, and there was remarkably little variance by people by height. Seemed in that limited thread the biggest difference was just 2".
WL on me will be about 30 or 31 inches from my front hairline and I'm 5'2".