Not much to do? You could say that. Snow ain't falling like its supposed to, so I'm not playing hooky skiing. I have my Hawk GT top end torn apart, but waiting on cams. Not in hurry though. Trying to space my projects out far enough that I'll be in a rush come spring. Wouldn't seem normal otherwise.
I assure you, a 2013 wheel will fit a 2009. The axle and inner hub spacer are excellent indicators. Like I said before, the bearings are also the same. The only difference is the seals and outer spacers. The discs are the same, as well as the disc bolts and disc gaskets. So, the only things that you may have to replace or slightly modify are the outer spacers and possibly the seals. In my book, that's a pleasant walk in the park.
I was able to fit a 2008 Ninja 650R wheel to a 2006 ZX636 set of forks and brakes in under an hour with bearing replacement and a small amount of grinding of the hub and outer spacers. I'd say your proposed Versys project is simple enough to press "GO".