You might possibly be interested in checking out the YouTube channel MyDeepGuide. Guy does in-depth reviews ofbmostly e-ink writing tablets, which perhaps is more functionality than you’re looking for, but some of those manufacturers also do standalone “just” readers. Or maybe you’ll be convinced to get a writing tablet :p
Duolingo got me enough vocabulary in Spanish to put the simplest sentences together, and then follow more robust lessons. I still think it was a good starting point, but I won’t use it anymore on principle.