[stumped]

unless, like me , they want to see a % read indicator for several epub books-in-progress ( like I can do with my amazon books on a dedicated kindle ). I guess there's no easy way to implement that. CC would have to go read records created by various reader apps. Moon pro does record that info somewhere as it is shown on its "recent" screen.

I will probably open from CC initially then resume from Moon+ recent screen, as a working compromise. That bypasses any use of the reader's own "shelf" and thus bypasses the original issue

Also, FYI,one of my tablets is a Fire HDX, & Amazon don't do widgets, so I can't mimic your setup. I can , I think, do the sync via dropbox thing with Moon+ but I have no real need to