How do I add a moderator to a single space?

For what it is worth, the same approach works with the PMPro adapter — the membership side is identical from here.

Could you say more about how you measured the result? I want to try this but I am not sure what success would look like.

We ran into the same situation last quarter. What worked for us was starting small and only adding complexity when a real need showed up.

Tried this on a staging copy first and it behaved exactly as described. Confident enough to roll it to production now.