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Dark mode’s bright future: How dark mode will transform Wikipedia’s accessibility
(diff.wikimedia.org)
This is a most excellent place for technology news and articles.
It's really not that complicated.
You give the information on where the setting is, then have an "enable now" button that calls the exact same function as clicking the toggle on the other page does. Having multiple ways to do the same thing isn't unusual and is trivial with properly designed code.