I like OP's idea but I wonder about the legality of it and how it might be used against BookWyrm by private entities. Interoperability/plugins that act as middle-men + open library seems like the way.
I don't member the exact model but I had an LG Voyager that i held onto for a long time... I did NOT want to give up my physical keyboard for the touchscreen keyboard so I held out as long as I could. If Samsung came out with a slide-out keyboard for smartphones I'd be on that shit right away.