Adobe ID for Aldiko-feedbooks

I have downloaded several ebooks which are EPUBs in the Aldiko ebook reader app on my Samsung android tablet. I am not using that app any longer and would like to read them using Adobe Digital Editions.  The Adobe ID for the Aldiko app is Aldiko-feedbooks, which I didn't realize I used until I had downloaded several of them, instead of my usual Adobe ID.  Since I can't change the Adobe ID for these specfic ebooks (or can I?), I would like to be able to read them in Adobe Digital Editions.  However, when I try to use Aldiko-feedbooks as my Adobe ID, there is not a choice to select that particular one. Why is this not available as a selection in ADE? I've tried to manually type it in but it doesn't allow this. Can another vendor be used?  Otherwise, I can't get to my books.  Thank you for your assistance.