I'm sure you will appreciate the 2-1/2 stops the 50mm gives you over the f4 lenses, not only indoors but also in its portability during touring, especially early and later in the day during the shorter days on the winter season. My guess is that there will be only a few opportunities to use the 70-200 unless you have specific photography only time planned and scheduled.

I think you will find that the 50mm is sharp enough and the 6DII's resolution good enough to allow some significant "cropping in" space to compensate where you couldn't zoom with your feet.

Press your thumb and forefinger together, say OMMMM and channel the generations of amateur and pros who documented the world while only using a normal fixed focal length lens.

Enjoy your trip.
C