First: Nobody on this forum will give you legal advice. That’s not what we do.
Second: The “you can’t ship the editor” part of the license is generally thought to mean “you can’t link your shipping game against any of the Editor libraries or plugins.”
If you build your world, and editor, using only the runtime support libraries and plugins (like any other game,) then I believe EPIC doesn’t have a problem with you having editor-like features in your game. What they seem to be concerned with, is whether you include any of the Editor-specific code in your shipping code – presumably because they might not actually have the licensing rights to sub-license some parts of the editor, in the first place?
Build your game like a regular game, don’t link in any Editor plugins/libraries, and there likely won’t be a problem with any editor-like features in your game.