[Userscript] Booru Sync - Syncing favorites and upvotes across sites

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I keep getting errors when fetching from Derpi:
Generally occurs on page 49 or 50, but it happened on 21 this time. Was running it from Twibooru to sync it as widely as possible. Also, do I need to switch to the Everything filter on either the source or destination booru to ensure as many images as possible are sync’d?
Anonymous #5320
How difficult would it be to modify the script to take a bunch of image IDs (or hashes, I suppose) and ensure they’re upvoted on the site in question?
In case of another site having some weirdness like Ponerpics did several months ago that caused all user upvotes over a long period of time to disappear.
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