Add a "Head Mod" role, So if a normal mod made a mistake, the Head mod can take care of it without the broadcaster stopping what their doing to stop what the normal mod did. You might think, "What Happens if the head mod does something bad" Well, the mod should be a very very trusted friend of the broadcaster, and from there, if the head mod Still does something bad, then the broadcaster does something about that, but there should be only 1 or 2 head mods. So the head mods can trade out service times, or just have 2 for extra head moderation.
There really isn't much a mod can do that another mod can't undo, unless you mean a mod saying or doing something that would get them timed out if they weren't a mod. But that is VERY rare in my experience, to the point of a streamer timing them out, which in turn revokes their sword.
To be fair though, editors are higher in the hierarchy than mods. Maybe worth adding to their responsibility, but a head mod would work too.