I actually had similar ideas when I find that some people will post hiring message in a thread. Then I found this, so nice.
I tried it out, it works as I expected. But a lot of the posts linked to their own website, and on top of that, most of the opening are closed already, make it less efficient and useful. I don't see a way around this giving the source of information. But if you ever find a way, that would be huge.
By the way, why is this comment section so weird? I'm new to PH.