Hey there Starko, welcome to the site and thank you for posting!
There are a few things you can do to improve the traction you are getting out of that B7200 of yours. I would suggest first, that if you are blading and the snow is 2ft or more deep, to make a few passes and not try to clear the whole driveway at once. We actually have a bit of a tutorial on blading tips - not sure if you've seen that or not, available here:
http://www.orangetractortalks.com/2009/01/how-to-clear-snow-with-a-snow-blade/
Regarding tire chains, yes, Kubota does make those available. Check your local dealership - if you are in Red Deer that would be "Key AgVentures" ph: 403-343-6112.
Ballasting your tires is a bit more involved than simple chains and you'll have to go with something a little more complicated than water due to your cold climate. Still not a bad idea if you are up to it - can easily add hundreds of lbs and the more weight pressing down on those tires the more traction.
My recommendation is to get ahold of some chains, install them on the rears, try making multiple passes on the driveway with your blade, and see how far that takes you. If you still are lacking traction, consider liquid in the tires or a ballast box (or some piece of something heavy on the 3pt to keep the blade down).