Django admin list_filter: RelatedFieldListFilter based on user

Question

The question is similar to Django "list_filter" based on the admin queryset. I need to use list_filter based on current user. But in my case the field span relations using the __ lookup. There is no useful "lookups" method on RelatedFieldListFilter. My approach resulted in the next code:

def custom_titled_filter(title):
    class Wrapper(admin.FieldListFilter):
        def __new__(cls, field, request, *args, **kwargs):
            instance = admin.FieldListFilter.create(field, request, *args, **kwargs)
            instance.title = title

            rel_model = field.remote_field.model
            qs = rel_model._default_manager.all()
            if not request.user.is_superuser:
                qs = qs.filter(user=request.user)
            choice_func = operator.attrgetter(
                field.remote_field.get_related_field().attname
                if hasattr(field.remote_field, 'get_related_field')
                else 'pk'
            )
            instance.lookup_choices = [
                (choice_func(x), str(x)) for x in qs
            ]
            return instance

    return Wrapper

Is there any better approach with current version of Django?