I just posted a solution I found to this issue if you are able to enable "Sharing over the net" in Calibre and make your library available to the Paperwhite's web browser. Here are the details:
https://www.mobileread.com/forums/sho...9&postcount=66
EDIT: Here are some refinements to this method:
https://www.mobileread.com/forums/sho...9&postcount=70