I'm not exactly an expert on XML processing, however I did some reading myself, on seeing your question. Here's a post XML::Twig tag conversion similar to yours which has been answered by Michel Rodriguez himself (author of the XML::Twig module). The approach given here would be of help to your question as well.

In reply to Re: Twig Mixed Content Child Text Replace Issues by ajguitarmaniac
in thread Twig Mixed Content Child Text Replace Issues by unknown_varmit

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