I don't think relying on a third-party website (Bitcointalk) as a primary source for the real URL is a good idea...
You can't rely on Google either. They obviously don't know what they are doing or they don't care.
and I'm not sure how many people are going to verify it.
That's their problem. It's like clicking on phishing links, downloading fake software, and not verifying it. What can be done is to inform them about the dangers of such actions and recommend what should be done. If they are smarter or don't want to listen, they will face the consequences.
But I've seen confused users who weren't sure what the real URL is.
There you go. Direct them to multiple sources where they can check the real .onion link. If Google interferes again and messes up or a new clearnet site goes down or gets redirected, there is always this ANN thread that should serve as official information. Bitcointalk hasn't had a serious security breach for several years, so the forum is quite reliable.