That’s right. I don’t think there is a good way to do it. I just take whatever link is provided by the small Fediverse icon. But I don’t think it matters that much for your audience, they’re spread over several instances and it’ll be an external link for some of them, no matter what you do. I’m not sure whether we have the ambition to solve this. I don’t see anything the user could do. Either this gets handled in some way by the software, or it is how it is.
I think Nobara is the other most(?) popular choice by gamers.
I don’t have much experience with gaming distros. I just think whatever it is, a computer shouldn’t bee too locked down for a kid so they can also install other things, try other tools like an office suite, video editing or content creator stuff and maybe even have the experience of messing up. Within limits of course.