Restrict topic access by topic tag - user group

Use case: I have 2 categories that focus on different theme, and topics in them have rating tags, I would like to restrict the access to topics with a specific tag to a group. It could be done by creating a rating sub-category under each category. But as those sub-categories share the same function (to limit access) and seem a bit redundant if there are a lot of parent categories.

Do you think it’s possible to achieve this by overwriting the redirect function through a plugin? I was also looking for the possibility to develop it on my own. Any suggestions or ideas are appreciated. Thx

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