Just got to chose the right altitude.
Er... nope. You're not going to have sheer winds left at 2K then right at 4k... They'll be shades or gradients or gradual shifts.
Also, if you're GLIDING and you can't maintain a level alt (or, say, climb to the right wind layer you want) you're unable to pick and choose, and all winds would act on you. In the end if you had reversed winds across different alt bands, it would all be a wash, as you descend through them all the headwind would counter out the tailwind, and vice versa.