The D850 is an awesome camera for this! The Camera Store in Calgary lent me one for 3 weeks to digitize a collection of historical negatives for a show.
I normally use a D800 with a Nikon 60mm f2.8 G micro lens. I love the auto focus as it’s fast and accurate - just as good as manual focus, but faster and easier to use. I’ve had various Nikon 55 f2.8 manual focus macro lenses. Good optics, but only go to 1:2 so I’d avoid it for 35mm as extension tubes are a pain. My backup macro lens is a Sigma 70 f2.8, which is great optically, but clunky in its auto focus, so I manually focus it.
The 60mm focal length is excellent for this range of film sizes. For 35mm film at 1:1, it’s close enough to the film that I find it easier to remove the lens hood but that’s not a big deal. A 105 mm lens would mean the camera is high up on a copy stand for the glass negs. Optically, both are good. Stick to the "sweet spot"aperture of f8 - f11 and adjust the shutter speed for exposure changes.
I’m curious - are the glass negs lantern slides?