How to get image to span across pages when doing a stab binding format?

I'm not really sure how to ask or word it. I'm making a photobook for class and I decided to do a Japanese stab binding method for it. Of course, this means I cant print normal 2up saddle stitch, so I need a margin in the paper for the spine and I've marked it out in the image. Splitting the image is the only thing that makes sense to make it work, but I was wondering if there was any specific way I can maybe do it without splitting the image in two? Like having it 8x8 facing pages but when printing add an extra inch but only the inner part, I guess.