Not really... I was in a similar situation with a thread and post table from another vbulletin and there was no easy way of doing it...
What I was told I'd have to do (and indeed concluded it was probably the only way)
Install a new copy of vBulletin (or in your case mybb)
Copy the posts and thread table to the new database
Make a custom script to iterate through each post and add each unique user to the user table
Once complete use impex to import...
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