Greengrass v2 add component

There should be no need to create a new core device. You can add the new component to your deployment and remove any that are no longer needed and the deployment will take care of getting the existing core device(s) that are associated with that deployment synced up with your changes. I actually used this very method while creating and updating a demo I was working on recently. Keep in mind that this action may interrupt processes running on your existing device, so if it's production critical plan around this.