Asking for the right system is jumping the gun. If you don't get the right systems thinking done up front the shape of the system won't save it.

A failure mode with a lot of community management systems is that they're adopted because they have the vibe of keeping the bad people out. And that vibe will see criticisms of the community management document/team/actions as a way to sneak the bad people in.

Imagine I told you I found a rando discord server dedicated to a tabletop RPG I love, but complained that the moderation team was a clique. I claimed that I feel forced to fit in by pandering to their sensibilities and biting my tongue on other topics even if they're just flat out provably wrong. Nobody would assume I'm just salty because I secretly want to post porn, cuss and be racist in #general. Because we all know discord mods are notoriously petty tyrants.

Now give that discord community a github page, and copy-paste in an HR document. The way expectations snap into treating them like levelheaded professionals with unassailable intentions and righteous goals is the reason this topic always goes nowhere.