Just thinking, maybe all we need to do is downgrade the bnereader app to get the old fonts back? And then disable automatic updates in the new Nook Hub. This is a link to the old bnereader apk (for glowlight 4):
https://su.barnesandnoble.com/nook/p.../bnereader.apk
The installation fails but it may be possible if you uninstall it and then install the old version. I believe you would need root to uninstall it. Can someone with root try it out?