Hi @mullerivan,
The docs for Styling widget instances give three approaches. The one you'd like to avoid is just the first.
In your case, I guess I'd recommend the second approach, to adjust the widget attrs inline in the form definition:
class ProfileForm(forms.ModelForm):
full_name = forms.CharField()
full_name.widget.attrs.update({'class': 'Anyclass',})
class Meta:
model = Profile
Given that multiple options already exist, adding yet another keyword argument is not going to be worth it on balance.
(The benefit won't justify the extra API surface area.)
Also see the ModelForm docs on Overriding default fields. If it's API you really want in your project there's nothing to stop you creating a base form class or mixin the takes an additional extra_widget_attrs and sets that appropriately during __init__(), as a generalisation of the third strategy outlined in the Styling widget instances docs linked above.