Something I've been tinkering on for the last few weeks is absent.dev[1], was working towards getting the guts to share this on HN but there's a few things I want to polish first. This is the MVP, but it will essentially be moving towards what you're suggesting, much more customisable news aggregation and more importantly, where you consume it. Feed agnostic, channel agnostic, in the form(s) you want (longform, shortform, summary, tl;dr etc). You can check the clustering logic on the digest[2].

1. https://absent.dev/ 2. https://absent.dev/episode/ABS-0014/clusters