That's quite a story P.E. and unfortunately not an isolated one. So
much of what you said about the social hierarchy growing up, brings back
bad memories and this business of elders discussing with their families what was meant to be confidential, is all too common.
When one lays their JW story out in order as you have, it's obvious that something is very wrong with the religion. All the clues are there an yet as they are happening, we see them one by one as isolated incidents that are easy to excuse on their own. One day we realize these isolated incidents have joined forces and we wake up knee deep in a tangled mess that takes a major life change to get out of.
Anyone reading your story can see that the remedy to this situation very obvious and that you know what you need to do. The trouble is, it's better to live with the devil you know than to face change and the unknown.
Hopefully your wife has stopped going to her father with tales about you. That would have been a deal breaker for me if my wife did that. Since you were so understanding and forgiving about her marriage ending actions with that "elder" she will in return be supportive of your decision to stop allowing this religion to run your life. Most of what you will have to deal with to make this happen, is uncomfortable and inconvenient but the growth you experience will be worth the temporary discomfort.
You knew that showing up to the meeting with a beard would have an adverse effect on your situation. It seems to me that you can drag this thing out by going back week after week for more or you can just stop, say nothing, answer no questions, give no excuses just simply stop going there and let the cards fall where they may.
By the way, what happened to that elder ??? Seems to me he should never be in a trusted position again.
What about your father and his cancer treatments. I'm hoping he survived.