Josh, is it possible for you to shoot some tests before you go? I think you may find frames similar close to home. Then you might make the choice yourself.
A fixed ratio such as 3:1 has the advantage of giving you predictable recording times for your media, but given what you have described, I don’t think that’s an important criteria as you will have the opportunity to manage your media as required when shooting.
BRAW Q0 is roughly equivalent to 3:1 but will take less space when the frame has lots of sunny skies. It will take more space potentially when shooting lots of detailed content but in village scenes and other situations you may want to capture all the detail possible.
I don’t think you can go wrong with either choice and Q5 or 5:1 may also work well for you. I tend to use the highest quality codecs for important work and choose Q0. Others shoot a great deal and get good results with Q5. Try both at home.