Single mission or career? Problem with trying to do it as a career start is dozens of other missions are loaded together, defined in the DynamicMiss.cfg and the Campaign.cfg files. AFAIK (and I could be wrong, I have 62 years experience at guessing wrong
) all ships that spawn in campaign are added by one of the .mis files, so the trick would be to find out which one is loading traffic or docked ships at Pearl.