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You could set up a tripod such that the print fills the frame. Mark out on some sort of base board so that positioning the print is easily repeatable.
You can get copy stands pretty cheap but they do look a bit flimsy.
For doing negs I’m actually getting the best results from my little rx100 compact camera, it’s able to focus a lot closer than even the pucker macro lens I have for my 5d.
Nope! But I can recommend using a digital camera to photograph them. It will likely be much, much faster than scanning.