Love this approach — using existing hardware creatively instead of buying new gear. The Readeck + Calibre pipeline is clever, especially since Readeck can export directly to ePub.
One thing worth noting: if the "requires a computer" limitation bothers you, KOReader (an open-source reader that runs on Kindle) can fetch RSS feeds and even Wallabag/Readeck content natively over wifi. Might close that last gap without needing a new device.
One thing worth noting: if the "requires a computer" limitation bothers you, KOReader (an open-source reader that runs on Kindle) can fetch RSS feeds and even Wallabag/Readeck content natively over wifi. Might close that last gap without needing a new device.