The choice is so rider specific that any answer you get is likely to not suit your needs. Personally I think it would be just about the perfect bike for that kind of riding, but I love drop bars and have happily used them on pretty much any type ride including very technical single track. I like them quite low regardless of the surface type or tour length. Some folks don't even like to do paved road tours with them and/or like to ride in a "sit up and beg" position that I would find miserable especially on rough surfaces.

I'd be inclined to ride a Pangea pretty much box stock on that ride if I had one, but you really need to figure what works for you personally.