KTM,
I have never seen a Yanmar utility tractor with a mid-mount PTO. I can do some research but I beleive there is no one making an attachement to go from the 3pt to drive the forward blower. I did hear that someone has designed a mid-mount mower driven off the 3pt but i have not seen it yet. You could custom make a front snow blade if you are handy. I know a couple places that sell a generic blade then you make your own mounting kit. The eastiest is to buy the 3pt rear blower. I lived in Maryland for almost 30years before moving to VA. I found that a cheap and simple 6 ft straight blade with the right techniques did the job every year with proper weighting. Are you going to use it commercially? If not I would save your money. The Yanmars and most other Japanese tractors have the locking differential in the rear that will pull you out if you start getting stuck. If you have a steep driveway then I would recomend a 4x4 if you have not bought one yet as they have even more gripping power.
Best Regards!
Bob