Splitting a thread FROM a post?

[Mouth]

Is there a method/addon to split a thread FROM a post?

The example scenario being I have a 5,000 page thread, and I want to split it off into a new thread for all posts after post #3,500? Obviously it would be almost impossible to use inline moderation and select 1,500 posts to effect the split.

Perhaps from the DB? Something like create the new thread, then update thread_id for all posts belonging to the current thread where post_id > xxx, and then rebuild threads.
Splitting a thread FROM a post?

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