Moderation tools for relay operators are hard to come by. That said, nostr:npub1jlrs53pkdfjnts29kveljul2sm0actt6n8dxrrzqcersttvcuv3qdjynqn recently released Landlubber, which is a web gui for relay moderation, and I think Coracle was the first client to implement WoT filtering, so I wouldn't be surprised to see some kind of WoT-based moderation tools added to Landlubber. Though I think nostr:npub1kpt95rv4q3mcz8e4lamwtxq7men6jprf49l7asfac9lnv2gda0lqdknhmz's pagerank might be a more appropriate starting point for what you are talking about.