I would use a good DSLR camera with a 35- 50 mm lens on a copy stand or and overhead tripod. There are old technology scanners with flush surface glass still around but they are getting hard to find. I collect scanners and have seven but none of them will work, when you lay the thing flat on the surface there is a slight gap that makes the image come out slightly blurry.
With a sharp lens 1.2 to 1.8 on a digital camera it will come out fine, then pc. it together in Photoshop.