IDK if anyone has a Koreader plugin for this, but I think most people use Calibre and the Fanficfare plugin to manage their fics in this vein, and use the FFF 'Get story URLs from email' to periodically update fics via work/series/author subscriptions to AO3. It's less likely to get you blocked than selecting dozens of in-progress fics and running FFF's 'Update existing fanfiction books' all at once (which is more likely now with the rate-limiting they've got in place).
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