Digital questions are best taken to APUG's sister site, hybridphoto.com.
But insofar as this is just a question about copy work with a camera, which could use film or digital, I'll leave the thread open, as long as it stays about copy work.
Roger's answer is the answer I would give. I've done some duping like this using a camera on a copystand with a 5500K lightbox (Kaiser even makes a stand with a lightbox built in, if you want to get fancy). You can run some tests with the dupe film you have and determine if any filtration is required.