Summarize this Topic → Write a Summary for this Topic

Could a webhook help automate this for new topics? I have a webhook, and receive a topic event with posts_count=1, so I know it’s a new topic. Immediately after that, I receive a post event with post_number=1.

At that point, I assume I could easily create a second post via the API as a placeholder for the summary. But I would very much prefer to have the summary as the first post- can I juggle the posts at this point somehow, via the API? Maybe delete the first post, add my summary post, and re-post the first post?