I suspect that your proposed trolling methods would be hardly noticed by your intended target. No doppler. Very localized. And other reasons. So unlikely to accomplish anything like your goals, even if all you want is to let someone know you are unhappy. The most likely outcome (but highly unlikely fortunately) is that one of your balloons would be run into by some poor commercial or private airplane with something between negligible and tragic consequences.
The German farmer who used a potato cannon to attack incoming flights at an airbase in Germany was much more effective. But what he learned, and what you would learn if you accomplished anything in your trolling endeavor, is that once you annoy a large powerful organization, that organization has many resources to return the favor, amplified greatly.
If you are fine with that, proceed. Otherwise, pay very close attention to what Blueskull said.