There might be an easier way, though. Wrap your article element in a book element, and move the title info from articleinfo to bookinfo. That would leave your article element containing only the body content, which is valid. Since this is processed as a book, you will get the book titlepage, both recto and verso sides.

<book> <bookinfo> <title>etc.</title> </bookinfo> <article> <para>First content of the article.</para> etc. </article> </book>