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I'd setup an old laptop running Linux as a web server. Or an old router with OpenWRT and the DNS & DHCP & Routing disabled. Anything to hand, need not even have WiFi. Have it do all and serve a webpage with database or notetaking input field.
Then any ereader with web browser can be used to display the stats & input text. No customisation needed at all. No need for always on WiFi.
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