Worst case they could read your letter and make a note "never to be hired or interviewed". If you go with your third option there is a tiny chance they'll actually get worried about you showing up on the premises, and consult law enforcement. Most likely they'd open your letter, see that it is a rant, toss it without reading more than the first sentence or two, and never think about it again.
This seems like a very over the top reaction to a rejection letter. Over a long and modestly successful career I've benbeen rejected by dozens of companies. Get used to it. Frankly receiving a rejection letter (even a form letter) is fairly courteous as employment opportunities go. A lot of times employers will simply ghost you. You are not the main character in their story.