It doesn't exactly exist in market as a product yet but the Intel NUC Laptop Element may promise to do this. From the marketing material I have seen it's basic

It doesn't exactly exist in market as a product yet but the Intel NUC Laptop Element may promise to do this. From the marketing material I have seen it's basically like a cartridge that presumably you can slide into any kind of chassis. On the go it could be a 15" or 17" laptop chassis being sold along side with a Desktop chassis for at home. I'm also considering the same albeit a bit different - a standard NUC or even a Chromebox that I bring to work and use at home - all over USBc. And for in-person meetings where I need a device I have a thin and light Chromebook in my bag.