Gallery When No Variation Selected

Hi, is it possible to display the images, that do not have variations assigned to it, when no variation is selected? There are some images that apply to all variations. For example, I sell diaries. The inside pages are the same for all variations. But the outside front and back covers are different. So, if no variation is selected, I’d like to show a main image of the product plus a gallery with images of the inside pages. And when a variation is selected, it will show just the front and back cover images of that variation.