Allow nano server to be installed on a removable drive
I think he meant that the nano server could be installed and running from an usb stick as it possible with ESXi hypervisors. This scenario is useful for nano server installations as Hyper-V host.
Tim Cerling commented
Does this (https://blogs.technet.microsoft.com/nanoserver/2016/10/15/introducing-the-nano-server-image-builder) meet your needs? That allows creation of bootable USB media.
As to a running instance moving from one server to another, that gets into a licensing issue more than a technology issue. Since a license can be moved from one physical host to another physical host once every 90 days (?), running a system from removable media seems to have limited usefulness.
Maybe I am missing something in your request? Maybe a more complete explanation of the what and why would help others understand what you are looking for.