I am sorry I'm not sure that is possible without adding it to the regular skirmish. Campaign story editing is beyond us at this time and point. I can modify stuff like system trait bonuses or fleet sizes but not the story.
It has been nerfed hard for release. I won't go into details, not sure if the NDA is in effect about it, but the Dark Apostle's line was most likely a throwback to an early edition that did not make it into public for the sake of balance.