With more investigation, the only content that you can gain access to on a given page in an open Pages document is just body text when using AppleScript. And then you cannot export it using the Pages export feature. A separate handler must be made to send that body text to a print to PDF file solution. So if you have other content than just text, it will not qualify as body text and would be lost in the preceding activity.
It would be better to export the Pages document to PDF, and then write each Page of the PDF to a separate page numbered PDF. I have AppleScript code that can split an exported PDF into numbered PDF pages. At the moment, it writes these to the Desktop, but I can add a output folder selection, where the PDF, and its split pages can be written to that folder selection. This approach preserves the visual content of the exported PDF.