When you post on Facebook, you can restrict the audience, and you can exclude specific people, or post only to a certain group of people of your choosing. Would this be helpful in any way for future posts should you decide to make them?
Good that you wrote the letter -- it was in writing, which probably helped a lot. The Organization™ is very legalistic, and it seems you called them out on not following procedure. It seems that they had to default to their rules. But it's rather interesting that a CoC post didn't lead to anything else. You got lucky. Not everything has to be admonished a couple of times before proceeding to JC. Please correct me if I am wrong.
I mean, there were at least two witnesses. You had committed an "apostate" act (vomit) by your post. Not everything needs to be admonished a couple of times before a judicial committee, right? For example, when Brother X and Brother Y, two closeted gay pioneers, fall in love and start an affair, the elders do not need to admonish them to stop their affair over and over ("Brother X, please stop falling face first on to Brother Y's erect penis. We warned you about this before, you know. Keep doing this, and we're going to have to go all JC on you...").
My guess is that you have a friend of two on the BOE. Well done. :)