This is a change that reproduces the issue

where it runs successfully on Python 3.13, but a `NameError` occurs
on Python 3.11.

It corresponds to an updated version of the reproducer reported at
python/cpython#124520 (comment).

comtypes/_post_coinit/unknwn.py

@@ -76,6 +76,9 @@ def __new__(cls, name, bases, namespace):
         if dispmethods is not None:
             new_cls._disp_methods_ = dispmethods
 
+        return new_cls
+
+    def __init__(self, name, bases, namespace):
         # If we sublass a COM interface, for example:
         #
         # class IDispatch(IUnknown):
@@ -85,26 +88,24 @@ def __new__(cls, name, bases, namespace):
         # subclass of POINTER(IUnknown) because of the way ctypes
         # typechecks work.
         if bases == (object,):
-            _ptr_bases = (new_cls, _compointer_base)
+            _ptr_bases = (self, _compointer_base)
         else:
-            _ptr_bases = (new_cls, POINTER(bases[0]))
+            _ptr_bases = (self, POINTER(bases[0]))
 
         # The interface 'new_cls' is used as a mixin.
         p = type(_compointer_base)(
-            "POINTER(%s)" % new_cls.__name__,
+            "POINTER(%s)" % self.__name__,
             _ptr_bases,
-            {"__com_interface__": new_cls, "_needs_com_addref_": None},
+            {"__com_interface__": self, "_needs_com_addref_": None},
         )
 
         from ctypes import _pointer_type_cache  # type: ignore
 
-        _pointer_type_cache[new_cls] = p
-
-        if new_cls._case_insensitive_:
-            new_cls._patch_case_insensitive_to_ptr_type(p)
-        new_cls._patch_reference_fix_to_ptrptr_type(p)
+        _pointer_type_cache[self] = p
 
-        return new_cls
+        if self._case_insensitive_:
+            self._patch_case_insensitive_to_ptr_type(p)
+        self._patch_reference_fix_to_ptrptr_type(p)
 
     @staticmethod
     def _patch_case_insensitive_to_ptr_type(p: Type) -> None: