Is there a Microsoft .xps file editor? By this I mean the the output generated for Print-to-File. Preferably free and open source. Paid software would be a second choice.
My own solution. Rather than use the XPS option to Print to File, instead I will use freeware CutePDF Virtual Printer. I can then select that as a printer and it will send the output to PDF. I can then use PDF X-Change Viewer to edit it. I am likely to accept my own answer when superuser allows in 2 days.
Even better than CutePDF (possibly) is: PDFForge