So after several decades of playing, your species has spread outside your borders. Maybe they migrated, or you lost some worlds in a war, or they were sold off as slaves at the market. Point is, there is a diaspora of your species out and around, and you want them back. So you commission some policy eggheads and marketing specialists to engineer a campaign to attract them back:
Come Home, [original_species_name]
This would be an edict (I'm thinking timed) which for some credits and maybe consumer goods, members of your original species abroad will have an extra immigration pull to move to one of your worlds, so long as they are free to go. Particularly unhappy pops will be more likely to take the offer, although that is already the case now, I think? I'm unsure.
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