Mark, could you turn this into a dynamic page based on the category? Each dynamic page would represent a category and would display a gallery of images belonging to that category. Your selector repeater would be the same on each page and would show all the categories.
You’d have three datasets – one for the category item that is the basis of the dynamic page, another for the selector repeater (it would show all categories), and another for the images belonging to that category (it would be filtered to show only images for the current dynamic page).