I am looking to do the same thing (migrate ee v4 to WordOps).
When you say "create a new server with Wordops" are you suggesting to start with an entirely new server (a fresh VM with a fresh install of Ubuntu, for example), or are you suggesting to deploy a fresh instance of Wordops on the existing VM, and then migrate the WP site data?
Also, am I correct in thinking I can migrate the the site using something like the Duplicator plug-in on Wordpress, or is it necessary to migrate the site using a command line procedure along the lines of what's detailed here? As that refers only to migration from EE v3, I am not sure if it's applicable.