Toss the 50 f/1.8 and get a 40mmSTM. On a 6D it's as close as you'll get to a compact snapper, and the 40 is hands down superior to the 50.
Absolutely take the 85 and shoot wide open as you state - one or two flattering shots of your wife with notable landmarks softly seen in the background, and she'll become a lot more tolerant of your picture taking
That 70-300 is problematic. You probably won't use it as much with several lenses to choose from, and it's darn heavy in the kit. I've made several trips with too much gear, and frankly it's a mistake to take so much unless it's solely a photography expedition - you won't use it in museums, stores, theaters or on subways, and after 2 or 3 hours you will regret packing it.
And what bag will you take out each day, anyway? What about a small flash for the 6D? That 90EX works quite well for the 40STM and is cheap, but don't stint on batteries, those AAA's poop out pretty quickly.
That gorilla pod won't hold the 70-300, which is where you really need it.