Your idea would work but you'd likely need one on both sides, depending upon the loss of air speed as the wind whips round from the deflector. It might be easier to raise the little fan up and just point it diagonal into the canopy, as the leaves will pretty much do the same thing as your deflector would.
I am all good here! Watching the babies grow. Haven't made space in the closet, yet, but I really should as the other buckets have water and that will pose a humidity problem in the near future. But I'm stoned and lazy. :D