Toggle between using book cover and my own screensavers?

I just set up my own screensaver by adding a 'screensaver' folder to the .kobo folder and adding a PNG to it as described somewhere on this forum.

Sometimes I like to see the book cover, and for some books I prefer to use my own pictures. Is there a way to toggle between the two from the kobo?

Using this ‘screensaver' folder overwrites the book cover option. And if I turn off the book cover option in the menu, it reverts to the kobo Walmart affiliate screen, which I did remove, but that’s another story. Actually, if I could replace that Walmart affiliate screen with my own images, this would work as a screensaver when I deselect the book cover as screensaver option - is it possible to do that? That way I could remove the 'screensaver' folder and toggle between the book cover and the screensavers that replaced the affiliate. Feasible?