> class Description(ChangeImplementor, models.Model):

I might have a flaw in my logic, but if you were to switch the bases, 
inherit from models.Model first, and implemented a save() in 
ChangeImplementor, models.Model.save() should be called first, create 
the row, and by the time ChangeImplementor.save() is executed, you 
should have access to the primary key.

Maybe worth a try.

Michael

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