For wind to sensibly contribute to thickening the stem, the roots have to feel it. Which means the stem has to move, and that requires more than a very light breeze. Plants receiving some good wind will develop thicker, shorter stems.
However, a very light breeze might do the opposite. If the breeze does not flex the stem, all it does is increase transpiration in the underside of the leaves, and renew the CO2 faster, which can speed up growth. Larger leaves and taller plant, but not thicker stem.
The problem in this case is that salvia (unless yours has been slowly acclimated to something else) is not well prepared for wind. In the mexican mountain forests you have high humidity and low air flow in the bush, and lots of air flow can dehydrate it quickly unless ambient humidity is high.
To make your salvia stem thicker I would first of all increase the amount of light. And perhaps prune it to reduce weight if necessary, taking cuttings in the upper part and favoring the sprouts closer to the base. But light breeze won't work.
"The Menu is Not The Meal." - Alan Watts