Handling internal links in Sitecore 6.4 cloned sites

We are attempting to establish a Sitecore 6.4 architecture whereby we clone several sites from a "repository" site.

We have addressed many issues regarding data structure, but are left with one key problem:

How do we handle internal links within a cloned site?

The idea of cloning was to allow local modification of small p开发者_开发百科arts of data, but central editing of the main body of content. Editing directly in a cloned item breaks inheritance from its parent, at least in the field that is edited.

But: Sitecore internal links are stored as a GUID. When cloning an entire site, all links in it will refer back to the parent site. This is particularly problematic when the links are in a rich text field, storing the main body of content of an item. Replacing the link with a link pointing to the relevant item within the cloned structure will break the inheritance on this field.

Has anyone developed a workaround, until Sitecore provide a more sophisticated solution? It would seem that it would require significant extension of the LinkManager and possibly some regrettably solid rules for linking.

Ideas, solutions, thoughts welcome.

Edit: Cross posted to SDN Forum, not a great deal of help there.

Am I right in saying you want the cloned site to be self-contained once cloned?

So in the repository you have /respository/home with a link to /respository/home/product

Once cloned you want this to become /cloned/home with a link to /cloned/home/product (and not /respository/home/product )

The following quote is throwing my understanding of the problem, as it appears to contradict this - "If the link is in e.g. a rich text field then rewriting the link will break inheritance for that field, losing the benefit of having a central data repository for many sites."

Confused!