Yes, please do :)
Asking questions that you already know the answer to is fine, in fact it's encouraged (I'm quoting Can I answer my own questions, even those where I knew the answer before asking? here).
As long as the post is phrased in the style of a question (e.g. How can I recreate Organic Groups on a more basic scale?), and is on-topic/useful to the site (which I'm sure that particular question would be), then it would be a valuable addition to the site.
You never know, you might even get an answer from someone else in the community who's solved the same problem in a simpler way. Everyone wins really!
EDIT
Also see Posting and answering questions you have already found the answer to, in which the fabled Jeff Atwood himself encourages people to do this. I think this second question is actually a far better example, the OP is basically asking the same question that you have, just not about Drupal in particular.