@hitstun just wanted to check with you as I think I misunderstood your request for a CSS var for color scheme. Do you mean you'd like something like class=theme--scheme-[light/dark] on the body class? For instance when the user selects tokyo night, solarized dark, dark, kbin it's theme--scheme-dark and when light or solarized light, theme--scheme-light to save you from having to type out selectors for each theme?
And I did investigate the magazine description federation issues. Think I have an idea, I'll make an issue for it and it will probably be the next thing I work on after my current open PRs.