@Harry_Wood Got the bbcode converter into a good state, the changes are in Pull Request upstream in: Minor lint fixes and typos by harry-wood · Pull Request #4 · nlalonde/ruby-bbcode-to-md · GitHub WIP Assorted tests and fixes encountered with FluxBB by harry-wood · Pull Request #6 · nlalonde/ruby-bbcode-to-md · GitHub
Harry also added tests and improved the importer, adding permalink support to allow the old forum links to still work once content migrated. Pull Requests here: Add a test for create_post in import scripts by harry-wood · Pull Request #18893 · discourse/discourse · GitHub and WIP import script bbcode fixes in Fluxbb importer + some fixes to all importers by harry-wood · Pull Request #18953 · discourse/discourse · GitHub
On my backlog tasks is to run a full import into a cloned version of this site to test the importer and test integrations. I have not yet completed this task, but I estimate before end of November.