I have this custom search engine set up in Google Chrome:

https://encrypted.google.com/search?q=site%3Aen.wikipedia.org+%s&btnI=745

It searches Google for site:en.wikipedia.org {query}, and the btnI=745 is for I'm Feeling Lucky, so it automatically redirects to the first result. I like this better than using Wikipedia's search function directly because it gives me very effective approximate string matching, so I can misspell my search, or leave a word out, or just search for some keywords, and I still get what I'm looking for right away.

What I'd like is for it to use Wikipedia's secure gateway:

https://secure.wikimedia.org/wikipedia/en/wiki/

It's easy enough to set up a custom search engine that uses the secure version of Wikipedia's search function directly, but I can't figure out how to correctly incorporate it into my version going through Google. Nothing I've tried works.