Hi. I respect your struggle an whatever you do, you are going to be alert for the calls, visits, grocery store awkwardness. Because when you write the letters, you are back on the radar of every busybody JW that you know. And you will have burned some bridges And acknowledged WT authority as mattering to you at all.that would be my sticking point now, along with burned bridges-but I have done that in a different context with people I really value in my life, so I have a different perspective at outset-I actually lost something that mattered to me.
I'm in favor of not referring to yourself as a jw, live life with no JW constraints that are not of your choice and let chips fall where they will. Any JWs curios, they can ask and you can tell them w/o them getting in trouble.
The letter might feel satisfying. You could tuck into will to be sent to congregation on your passing. All the satisfaction, no harrassment