Hello Steve,
Thanks for considering Aspose.
Can you please try using Aspose.Pdf.Kit which is one of our components being used to edit/manipulate existing PDF files. Once the A5 PDF is created you can use N-UP & Booklet Maker feature of Aspose.Pdf.Kit to place number of pages over a single PDF page.
In case it does not satisfy your requirement, please feel free to share.
Nayyer Shahbaz
Support Developer, Aspose Sialkot Team
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