Add extra fields to a ModelAdmin form

So, I have a ModelAdmin that I need to add extra fields to. These fields do not exist on the model, but will be dynamically added to a custom ModelForm through the __init__ method, and logic inside clean will handle the returned data on save.

I can't seem to find any solid information related to adding custom non-model fields to a ModelAdmin form. The closest I have come is by overriding get_fields on the ModelAdmin class and updating self.form.declared_fields with the new fields I'd like to add. 

This just doesn't feel very clean to me and I was curious if there was a better way to add new fields to a ModelAdmin dynamically?

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