GPD Pocket 3 is a 8-inch mini-laptop with 2-in-1 design, modular port design :

https://www.zdnet.com/article/gpd-pocket-3-is-a-8-inch-mini-laptop-with-2-in-1-design-modular-port-design/

https://www.indiegogo.com/projects/pocket-3-a-modular-and-full-featured-handheld-pc#/updates/all