Im working on a little project right now that involves a newer
coach Emery strap. The leather ends are the same white leather as your bag. I painted mine & the back side that I was originally gonna keep white got some paint stains that just won’t budge now. Im gonna assume you’ll have a difficult time removing the stains from your Page based on my experience with the same leather. Have you tried wiping it with anything? Maybe Angelus white leather paint would work to cover it up?
More opinions welcome though, I don’t have much experience with newer Coach leather.