Someone once asked, "Why can't we just have one law making all crimes illegal." A capital idea.
I think you've hit on a similar solution for individual wiki installs - so I now suggest that everybody's wiki simply point to en.wikipedia.org!
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Then I called on the Mediawiki directory in my web browser. The browser
then redirects me to the page on en.wikipedia.org. I think that's stored somewhere en.wikipedia.org home page.