I love what you've done Georjanna! I agree with Krautboy that two duels is too much for the Finale.
There are some real obstacles to having the last duel on Day 39.
1) The memorial walk is before the last IC, which would be the F4 walking on Day 38, so the returnee would not be part of the ritual/rite of passage.
2) After someone is eliminated from the game, he/she gets food, talks to the psychologist, records final words, is examined by the doctor. greets the other jurors, eats, gets cleaned up. Those last jurors are not going to be together in time for the Final TC, not mentally and not physically, not emotionally.
As it is, the last juror doesn't have much time, but at least gets to sleep, eat, and more or less integrate with the others. (In Holly's case, less.)
As for an earlier final duel -- the call sheets show rehearsals two days in advance of the challenge, and no duel is being rehearsed on Day 35 or 36, so there isn't one on Days 37 or 38.
I now think from the promo that they will do a 9 person jury. I can't block it out all beautifully like you can though. I'll try to post some sort of visual rundown, just not in graphics form.
They have been doing Family Visit in the penultimate episode, but as there are two F5's, I'm going to say it is in Ep 12 at F6, the usual number.
The Call Sheets do not show any filming of a separate reward group in Ep 13. Not only is there no RC, but there is no IC until the third day, and there is no crew shooting the loved ones group that day. And there is TC that night.
The challenge is over around 1:30 pm, and the TC begins for the tribe at 5:30.
If FV is Ep 12, then Ep 11 must be the double tribal. I think that Ep 9 demonstrated there is no time for a duel in the same episode as a double TC.
If you block the IC's on to the schedule you have, you will see that a duel, an IC, and a TC all have to fit into Day 38,