Turn in your letter at the jc if you want, it's your life, do this however you feel works for you. Walk in wearing a cape if you want and hand it in. Okay, now you HAVE to walk in wearing a cape and hand it in. We need video, lol.
I like that text idea a lot. Emails have worse open rates than texts. Most everyone opens a text. It's pretty immediate too, as we all have phones on us most of the time but not everyone checks email that often. Who can resist the *ding* of a new text? Plus, it will spread so quickly and be opened so much that the elders won't be able to do damage control and tell people not to open it like they could an email. Well done.
Like Morpheus said, make it thoughtful and not bitter. You have a chance to make someone think here, a rare occurrence for a JW.