From the looks of it they are not threaded so that should make it simpler. I think I would assign them under usernumber 1 with the verying usernames so as to not affect anyone else's post counts. (provided such usernames are not being used already)
Is the main goal here just the ability to have them available for viewing in .threads?
Donate to UBBDev today to help aid in Operational, Server and Script Maintenance, and Development costs.
Please also see our parent organization VNC Web Services if you're in the need of a new UBB.threads Install or Upgrade, Site/Server Migrations, or Security and Coding Services.