Let me first state my general opinion (see also this discussion on meta): To keep the quality and attractiveness of math.SE at a reasonable level, I think it is important to counter questions probably copied from exercise sheets without showing any effort. But sometimes, there are little gems among them, and I feel that there should be some possibility to freely discuss these cases anyway.
Yesterday, I ran into this problem with this question on main, which was closed because of "no effort". Since I found the question quite interesting and I wanted to know the solution (which I didn't know at that point), I casted a reopen vote, which didn't make much progress in the first place. What's the proper action in this situation?
Add a comment that I want to have the question reopened? (feels right for me, but didn't work too well in the first place and was countered by a 4x upvoted comment "not written in a way to match the standards of this site")
Open a new question with the same problem statement, including a link to the original question, the reason for posting it again, and some "effort"? (doesn't feel right)
Edit the original question to add some garnishment to void the closing reason "no effort"? (doesn't feel right either)
To tell the end of the story: Later yesterday, together with Jyrki Lahtonen, we were able to find a solution to the question. First it was given as a comment, then, as it finally got reopened, as an answer. There is a new round of a closing attempt running, which — given the discussion in the comments — I can hardly understand.
Let me give a reformulation of my question: Currently, it seems a bit like it is possible to "block" a question for all users by asking it in a way that it gets closed. If others are seriously interested in the same question, I strongly believe that there should be a way to discuss it anyway.
Do you agree?
If yes, how should it be done? By 1, 2 or 3 as above? Or is there another possibility I missed?