Screenshot of a Kbin magazine's profile as seen within Mastodon, which shows it as a group profile.
https://media.mstdn.social/media_attachments/files/110/530/423/207/817/685/original/137de00a091a7048.png
Hey there!
You're not wrong, it can be done, at least in theory.
I can get it to appear as a group account which I can follow, but as far as I know the cross-platform federation isn't finished yet, and/or the kbin.social site may be overwhelmed right now.
Are you at least getting the group account to appear, as seen in the screenshot?
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