Welcome Simple Minds. Your story is a sad one - but your life can only improve now that you're awakened. Basically you are at a fork in the road; you can either send such a letter to the elders, or employ the adage, "Least said, soonest mended."
My personal choice is the latter, because if you give the wolves a bone, they'll never let it go!
I'd never put anything in writing to the elders. Why give them such ammunition? I would be polite and reasonable by personally thanking one of the elders who wants to visit me, and briefly state that "due to private & personal concerns which I'm having to deal with, I'd rather not have the shepherding call at present, and that the offer is appreciated. If things change, I'll let you know."
A person's information & thinking are what these vampires thrive on. Why volunteer to give them what they need?
I wish you well with the wedding, and with your choices when dealing with the "ravenous wolves."
http://www.jehovahs-witness.com/topic/428170001/fading-beginners-guide
p.s. Do you think that the elders' wives will not hear about any of the details you put in your letter? Take care.