They aren't fonts. They're theme variants.
What I was planning on doing when I upgrade our themes is to put the variant selection down at the bottom of the info centre on the main forum index page. The Mystic Multi (dark thingy) theme already has this arrangement and I think it's better. Less code to load on most pages and less clutter up top. It's not like people want to change variants every five minutes, so as long as it's accessible from the main page I think that is fine.
Devious, treacherous, murderous, neanderthal, sub-human of the West.