Detect pages with Markup to call flattenpages on

Hello,

A customer, who used Markup to hide some confidential piece of documents before publish in a application, call us to integrate these markups in his documents because Markup can be print or not with an option.
The solution to integrate markup which have been choose is to call flattenpages() on the document with a vb dll before upload the document.

The problem now is that flattenpages() disable summary index.
Is it possible to find summary object (or markup object) pages to exclude it from the pages to be call in flattenpages() ?

Thanks

Damien