Easiest thing to do if you want to re-engineer something from Origins is to create a placeholder mod that has a dependency on Origins. Open it up and go into the story editor. From the story editor window perform CTRL+SHIFT+F. This will bring up a search window and you can perform searches that will inspect every goal in the story looking for your search string. So type in 'FTJ_LV_StartHoELevel_SetupAfterMovie' and you'll find where that happens. It looks like you're on the right track.
