You could do this with South in multiple steps. 

1. South schema migration:
    Add the new field for the proper foreign key, but don't make the field 
required.
    
2. South data migration:
    Create a migration that appropriately populates the new field based on 
whatever rules you have.

3. South schema migration:
    Make the new field required, and optionally delete the old field.

Shawn

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