I bought a camera that was already re-centered, so I'm not sure of the actual procedure. It came from an ebay store in the Ukraine that specializes in Russian cameras. My guess is that converted K-3s are now more popular due to the HD 16:9 standard, so they're probably converting all of their cameras before they sell them.
It would be great, though, if someone came up with a way to convert the viewfinder in a similar way. It kind of sucks to not know exactly what you're getting. Since super-16 is 20% more negative area, wouldn't it be simple to just expand the mask exactly 10% on each side?
I've heard on here that when you re-center the lens, the Meteor covers the entire frame even at 17mm, but I'll have to test that to be sure.