Your love of the camera really helped me decide to get it. I trust your opinions. Two Z50s and the kit lenses would make a really nice travel kit. You would have a lot more reach with the 50-250 vs. the 105mm long end of the 24-105. I love my Z6, but if I really think about it, I would have to admit that I get more joy from my Z50. It's just so small and light! I need to try it more with my 50 f1.8 to see how I feel about the low light shooting of the Z50. It's very good with my 35 f1.8 and FTZ. I feel very blessed to have such nice gear that does what I want it to do.
My favorite travel lens for the D7200 has been the DX 16-80 f/2.8-4.0. I really like that range. I've tried that lens with the FTZ on my Z50, and it makes superb images but it feels a bit awkward. Nevertheless, it would still be a consideration for travel.