ohhh and .. bring 2 body for sure! Bring your favorite nikon and the a6500 working together. Master each one and use them for specific usage. You will know how much shadow you can lift for each one and how much highlight you can protect.
Nikon for Sunset/sunrise lapse and everything under 640iso
Sony for 4k/120fps gimbal/tripod and milky way/moonlight timelapse
Drone for BTS and few insert shots
And a sony E to F-mount, same mount - same lenses
I've been doing the Nd grad trick for timelapse and landscape since I started doing landscape photography maybe 4 years ago. With the A7s or even my "old" canon 6d, I don't have problem to squeeze the full spectrum of raw data of those camera and they aren't as good as nikon for DR. I haven't tested the a6500 yet but it shouldn't be a big concern.