getting an object x in an external method that can be passed as context to ContentInit( ... ).initialize(context)

I am trying to write a folderish Archetypes-based content type (by name of
'Almacen') that, on instantiation, will create a new content type on the
fly. This creation starts from a mutator of a text field of the 'Almacen'
content type, from which the new content type takes its name. The idea is to
have its schema managed by the 'Almacen' instance, which inherits from
SchemaEditor from ATSchemaEditorNG. I also want to be able to establish
relations (from the Relations product) between different content types, so I
cannot work on the lines of GenericPloneContent (I guess i need a fully
fledged archetype.) What I am doing, is to create a class in the mutator
with type.__new__(type, ... ), call registerType, and then call an external
method that installs the new content type.
The problem I am finding is getting an object (in the external method or in
the mutator method) that can be passed as context to ContentInit( ...
).initialize(context), i.e., an object x that can do x.registerClass(...).
I am using Zope-2.8.3 and Plone-2.1.1

--
Enrique Pérez
[email protected]