Is it possible to upgrade the iPod Nano 6th gen storage?

Well, the question text pretty much says it all. I love my iPod Nano, but 16GB is simply not enough, and it doesn't look like Apple have any plans for upgrading that line anytime soon. So unless I want to go looking for a competitor's product that will allow me to use my own SD cards, I need to consider the possibility of switching the existing storage in the Nano to something a bit larger. I've checked the official guides here on the site but none of them seem to be about switching the storage.

So, well... can it be done? Without breaking the device in the process?