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Updated. Let me know if there are still problems with the latest version.
Thank you very much! Got around to updating the script and used your code.
Big thanks for pointing this out and for the DM conversation on Twitter! While I ran this succesfully with ViolentMonkey, it seems Greasemonkey needs to be told explicitly to use unsafeWindow's jQuery. I added the necessary line to the script.
I think userscripts have a @run-at default of document-end, so wrapping it in a ready function doesn't seem necessary, but someone please let me know if something like this is best-practice.