double sided mpage

Hi I can easily use mpage to condense multiple single sided sheets on a single page. However I am finding it tricky to do the same for double sided sheets. In this case I am printing badges. Say my input is Badge01Front.pdf Badge01Back.pdf Badge02Front.pdf Badge02Back.pdf Badge03Front.pdf ... How would I combine multiple badges onto a single sheet, so that if I cut up the sheet into badges, I get Badge01Front on one side of the first badge and Badge01Back on the other side? (and so on). FYI, I may be using SVGs instead of PDFs, but this shouldn't change much since they are easy to convert. I have wrote a bunch of scripts that basically do this , but they are complex and fragile. Is there a clean way of doing this?