StaticInitialFormSet.py

class StaticInitialFormSet(forms.BaseInlineFormSet):
    _initial = None

    @classmethod
    def set_initial(cls, initial):
        cls._initial = initial

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        if self._initial is not None:
            self.initial = self._initial