I understand it can be annoying but when it does I temporarily host a text version of the article on my website and save it from there

Yes I use it and it works ok for me. Maybe Kobo will consider official support for Wallabag now that Pocket is discontinued.

I would recommend Wallabag or Readeck. You can use Koreader on your ereader for reading article saved with Wallabag.

If it’s only the database part that you’re looking for maybe you could look at https://nocodb.com/ Which is self-hostable.

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