Perhaps this is an idea for a bookmarklet: for any Wikipedia article, click on the bookmarklet and get the HN comments related to it.
Or any URL more generally. I'd use this.
There was something like this in the past, I think it even was nice enough to check URLs client-side to preserve privacy.
You might be able to use https://hn.algolia.com/ which searches every comment/submission from HN. Just paste in a wikipedia link to see if it has already been submitted, then click to the comment section.