What setup would you have for a road bike for overseas travel?

Yes. Commonly available parts and easy to work on. For me, external cables, mechanical shifting, J bend spokes, tubed tires, alu rims.

I went with a ti frame from Carver with couplers and customized geo. The one significant downside is it is not a light bike by any stretch of the imagination. https://carverbikes.com/frames/ti-all-road/