I believe the devs have said they're working on making that work more automatically. Like having it happen as soon as a user clicks a link to it for the first time on your server. And also making links to communities outside your home instance automatically be changed so that it keeps you on your instance where you're logged in.

For example right now if someone on BeeHaw.org clicks https://lemmy.ml/c/memes, it'll take them to lemmy.ml where they're not logged in. They should add /c/ tags like /r/ on reddit, and when someone on BeeHaw clicks something like /c/[email protected], it should take them to beehaw.org/c/[email protected] so they can stay signed in and comment/vote/post. You can do this manually right now by creating a link like so:

[/c/[email protected]](/c/[email protected])

I expect some innovation in this regard in the next few months. Rexit will have a big short term influx to the fediverse that will die down, but hopefully some that hang around are the developer types who are being shafted by reddit.