It's intentional that adjectives can only be changed, but not removed — And that vessels cannot be deleted.
But I like the idea of warping to static vessel IDs. I have just pushed an update that gives you the target vessel id on `inspect`.
With that id, you can simply do `warp to 6`. It also works across all actions, but some actions won't let you interact with non visible vessels, like `take 6` will require #6 to be present.