There's an e-ink optimised Android app, Einkbro, which I've been using for several years now. It's mentioned in TFA, for what it's worth.

One of Einkbro's highly underappreciated features is "save page as ePub". This provides the "web as ebook" experience you're looking for.

But it gets better: You can save multiple pages to a single ePub, where the additional pages are appended to the end of the document. This provides a book (or multiple books) which can follow a theme: a set of pages on a topic, a time-oriented collection of pages, etc.

The UI/UX isn't as seamless as reading online, but the end result is really good.

Note that an ePub document is a compressed archive of HTML documents. You can pull apart the ePub to edit it: re-order contents, re-title them, edit the underlying documents themselves, etc., using shell tools. On an Android device itself directly if you've installed Termux. A bluetooth keyboard helps immensely here.

I've been raving about this feature for years now, see: <https://toot.cat/@dredmorbius/107958709435468728>.