There are potentially a lot of factors here. If you wrote in and said you are a 4'- 10" (short) 85 pound woman touring with 20 pounds of gear, I would say don't worry about it, go for it.
I have done a few tours on 32 spoke front wheels. The rear wheel is far more likely to break spokes. I do not know how much touring you plan to do or your weight/ gear weight. How do you feel about sitting on the side of the road, unloading your gear, removing the cassette, installing the new spoke and truing the wheel back up and then repacking the bike. I really prefer to not have to go through that. (I am perfectly capable as I was a bike store owner/ mechanic for over 12 years.) If you can go 36 spoke in the rear, I would highly recommend it. Just like I see no advantage to have internal cable routing on a bike that has huge air catching bags attached to it I do not see having 4 less spokes in a rear wheel being any sort of advantage either. Also, If yo want to throw all this money into an expensive Dura Ace level hub to use on a 7 speed bike how about using a less expensive hub and spend the saved money on a drive train with more gears?