There's been an ongoing effort for a bit over a year now to make sure the torrents from sci-hub's archive are sufficiently well seeded (specifically, the scimag collection from library genesis, available at libgen.rs). It's about 80TB total, so with current hard drive prices you can maintain your own local copy of all 85 million articles for under $2k. Unfortunately I'm not aware of any tools to usefully browse the collection like what you suggested but it would be great to see something like that.
The main library genesis book collection is already available via IPFS (see freeread.org), so I wouldn't be surprised to see all the sci-hub articles available similarly at some point.