

I’ve been using Wallabag for a few years now and really like it. (It’s the one thing I’m not selfhosting, though – I’ve been using their hosted service. But it should run on a raspberry pi with no problems.)
You can also export to epub, but you have to do that manually. OP, does your ereader run android? There are wallabag apps available, which are nice because they usually work offline after downloading articles from your wallabag server.
Gotcha. The web UI in wallabag is nice and works pretty well with ereaders. It’s already black-and-white, although it doesn’t have pagination, so you’ll have to scroll.