Have you tried the Slider format? in5 enables several kinds of keyboard navigation by default, e.g.,
https://ajarproductions.com/blog/2017/07/24/how-to-export-accessible-508-compliant-html-layouts-from-indesign/#enable-keyboard-navigation-when-possible
You may be able to add custom CSS to get keyboard navigation with a flipbook but that has not been tested.