Hey-
I'm not aware of a plugin for this, but one may well exist. As for using this script, i'd probably advise against that. Avoid logging into a botting client when at all possible - even if you're not running a script. FWIW, the sudoku puzzles are not actually generated, but are selected from a pool of pre-defined puzzle permutations. So you can always just pull up reference images if doing this manually.
Also, I just founmd this: https://runeapps.org/runedoku No idea if it works, but worth a try!!
Apa