bbPress.org

quick response, I’m a UK farmer, so out a lot of the daytime !

As a ‘quick and dirty’ solution you would need to create the topic

Then in a new item I’ll add in the dashboard enter the post ID and the Topic ID

This will then create a new reply.

It will keep the existing comments.

from memory bbpress uses ‘anonymous’ for any user that no longer exists, but if you create a ‘deleted user’ I might be able to add that to the code