At work there are TVs on all floors in the break area. They only show CNN news all day long. It’s maddening to watch the biased spin every day. Most watching think it’s valid. Has to be a directive from company to stay on this channel. Been this way for years.
Maybe you could assign some kid to raid nearby electric poles, sign posts, etc with counter-propaganda — especially this O’Keefe expose. You just need to make sure that there’s a quick escape plan. It would make you feel really good to successfully pull off a caper like that.
I had pulled a few stunts myself over the years. One time at a store I flipped a bunch of Hillary books upside down. I protested having CNN dominate an auto repair shop. They switched to FoxNews. It felt so good!
Since your upper management is very determined, however, you must be very sneaking. You need to make a regular Scarlet Pimpernel [aka Zorro] out of some kid — a modern version, someone they would have trouble recognizing and who wouldn’t rat on you. Maybe spray paint on their parking lot — CNN is EVIL.
Also, you can use a voice recorder. Hide it in an air vent somewhere. No finger prints. Have it on delay ... silence for a number of minutes to keep you low on the suspect pool. Let it bellow out whatever you want.
Things like that.
Uh ... I better point out the assumption that you use some unknown voice — not your own.
But if you are well known as being outspoken against the Establishment, you might need to shift your profile for a few months. Pretend to believe in something — some beach that seems to be sinking under the sea and/or become a ‘Truther’. The more lame the better.