In fact, the ACX used to view Wikipedia lookups inside the book is proxied through Amazon, which I believe qualifies as a special interface.

Since 3G Kindles are restricted to interacting with the Kindle Store/Cloud, Wikipedia lookups, Translate, and social media sharing, Amazon has proxied all those services and restricted their 3G network from contacting non-Amazon internet locations --which seals the potential holes in their 3G.
It also means they are the real source for all those features -- no matter what one might have assumed.
Blocking Amazon will block the Wikipedia lookup as well. No exceptions.
There is a hack,
AcXE - ACX Enabler which allows one to install custom ACXs, including the sample Google Translate ACX in the same thread. @reader13498, If you wrote a Wikipedia ACX which did Wikipedia lookups, that would do exactly what you desire. I can't think of any other feasible solution
Moderator NoticeAlso note: this question is hacking related, and thus belongs in our Kindle Developers Corner subforum. I've moved this thread to the appropriate location.
