Encontré la respuesta yo mismo después de un poco de prueba y error.

Necesitaba crear mi AdminSite personalizado y luego proporcionar mi propia admin_view personalizada, que realiza la redirección. Luego, en la redirección, acabo de configurar redirect_field_name en None así:

 def admin_view(self, view, cacheable=False): """ Decorator to create an admin view attached to this ``AdminSite``. This wraps the view and provides permission checking by calling ``self.has_permission``. You'll want to use this from within ``AdminSite.get_urls()``: class MyAdminSite(AdminSite): def get_urls(self): from django.urls import path urls = super().get_urls() urls += [ path('my_view/', self.admin_view(some_view)) ] return urls By default, admin_views are marked non-cacheable using the ``never_cache`` decorator. If the view can be safely cached, set cacheable=True. """ def inner(request, *args, **kwargs): if not self.has_permission(request): if request.path == reverse('admin:logout', current_app=self.name): index_path = reverse('admin:index', current_app=self.name) return HttpResponseRedirect(index_path) # Inner import to prevent django.contrib.admin (app) from # importing django.contrib.auth.models.User (unrelated model). from django.contrib.auth.views import redirect_to_login return redirect_to_login( request.get_full_path(), reverse('admin:login', current_app=self.name), redirect_field_name=None # <-- Set this to None to disable the "?next=" parameter. ) return view(request, *args, **kwargs) if not cacheable: inner = never_cache(inner) # We add csrf_protect here so this function can be used as a utility # function for any view, without having to repeat 'csrf_protect'. if not getattr(view, 'csrf_exempt', False): inner = csrf_protect(inner) return update_wrapper(inner, view)