Good reasoning. The Techron won't stick to NikWax treated material. I withdraw my 2-step treatment recommendation with NikWax.
So I'd just go with Techron alone or, better, so I've heard, is Revivex from WL Gore.
I do know some bicycling wind jacket/shirts are made with highly water repellant fabrics like you mentioned, with no DWR surface treatment. (Nextec?)