I’d love to understand a bit more on why you are reluctant?
Here on Meta, changing the content of a post is something that happens often. It is explicitly a power granted by the different trust levels.
(Trust Level 3 grants editing titles & categories; TL4 allows full edits)
But assuming you have your reasons
I don’t really think a staff notice is the way to go. It feels a bit too in-your-face and I don’t think they are included in the community search (which is a main benefit of rewriting).
My preferred approaches would be:
- Reply with a complete question/answer post and mark it as the official solution (assuming you’re using Discourse Solved Plugin)
- Post a fresh topic, linking the old one