Can you use image editing software?
The way I do this with the Times Jumbo crosswords page is to scan it in 2 parts, then open them both in Paint.net
http://www.getpaint.net/ (other editing software can be used similarly). Then select one of the images, resize its canvas to make it large enough to include the other, then go to that other image and select and copy all of it, followed by pasting it into a new layer of the first image. That layer can then be moved to align the 2 images to form the complete page, and finally flatten the layers to make a single layer image.