Okay, so this
sounds like you'd want to run an appview + pds. (and possibly a relay, depending on some details.) Except for one thing:
> or dependent on Bluesky.
If you want to take this to an extreme, and are uncomfortable with how did:plc has not yet moved into its own org, then you'd want to also run your own plc server, etc. The problem with doing this is:
> If people wanna follow on bluesky they can
You lose this. Because you're now not running on the main atproto system, but instead a fully parallel one of your own.
Anyway, you could start on this by running a PDS via the reference implementation here: https://github.com/bluesky-social/pds and then building your own appview (application).
You could also take a look at Blacksky's implementation https://github.com/blacksky-algorithms/rsky and if you end up using it, consider throwing them a few dollars. Alternative implementations are super important!