Sorry, can you expand a bit here.
We are also working through a similar issue at Discourse, in fact I do not have admin/modertor access on our dev instance. I completely hear you on the vast advantages of keeping the admin/moderator count low.
Can you spell out the problem?
Keeping in mind there are a few building blocks you can lean on:
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Category moderation, you can define moderation over specific categories to specific groups. This allows high trust users higher flexiblity.
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Trust level system … at TL4 (manual) a ton unlocks
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assign allowed on groupssite setting (which unlocks assign for specific groups)