For anyone interested I worked out a solution by using the “CSS atrribute selector” to target each tag-links’ title attribute – wordpress automatically adds a title of:
title=”View all posts in (category name)”.
So I targeted each category with a css selector like this one, to target all links with a title attribute containing the word “Design”:
#yourselector[title~=Design]
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If anybody has a better solution – or workaround – feel free to add it in here!
-Alex