how to override a ModelChoiceField in order to add FKs directly in a TextInput?

I can get text inputs rendered fine by setting the widget to a
TextInput like so:

myrelation = ModelChoiceField(MyRelatedClass.objects.none(),
widget=TextInput)

But I still get ModelChoiceField validation errors on validate:

'Select a valid choice. That choice is not one of the available
choices.'

Can I disable the ModelChocieField validation or override it? Or can
I override the ModelChoiceField entirely? I tried using

myrelation = IntegerField(widget=TextInput) but get:

Cannot assign "123": "MyClass.relation" must be a "MyRelatedClass"
instance.

Any tips would be greatly appreciated.

Tony

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