It's been awhile, so I thought I would check back in on this one to see if anyone has tried anything new with the backdoor noises. I have taken the doors apart several times this summer and I have foam stuffed everywhere around the sunshade and I still get clicking noises out of both. It just seems to me that the entire sunshade area is REALLY poorly designed. I rode in a 2021 Honda Pilot for work the other day and the rear doors didn't make a single noise and they had the sunshades as well. The rest of the vehicle sucked, but at least it was quiet I guess.
In other news, I did have the driver's seat fix (rubber hose/clamps) done by the dealer last month and that has really helped the seat from shifting and the noises I was hearing from there. Now if I could just figure out the backdoors...