I don't think exactly what you want exists, and I would be surprised if it landed soon. Under the hood, this would require subscribing to all the communities on lemmy.world
but then not showing them in your subscribed feed and instead providing some kind of "remote local" or similarly confusing view from sh.itjust.works
, which is likely to be pretty hard for folks who already struggle with the mechanics of federation to understand.
Two things you CAN do are:
- Subscribe to the communities that you're interested in on lemmy.world. Just because the communities are homed here doesn't mean you can't subscribe to them. At which point they'll show up in your subscribed list as posts in a remote community.
- Visit https://lemmy.world/. You won't be logged in, and can't comment/vote... but you can browse the full local feed from there. I realize you said this is what you don't want to do, but I reiterate it because it's on the short list of things that are closest to what you want to do.
Of these, I'd employ the first. Just sub to whatever communities you find interesting, it doesn't have to be all of them. And if you want to find new communities that are active, visit the anonymous local feed just to see what communities are hopping that you're not already a part of. Then sub them to interact from your instance.