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I wouldn't claim to have a full understanding of your question, but you may try the demo I attached to this post to a recent thread in the well structured forum.openoffice.org/en, and then tell me if it helped you.
(The demo was actually made with LibO and works in both branches, of course. You need to permit the execution of "macros", however, or to move the code to a module of the 'Standard' library of your LibreOffice. )