Hello MatUdeS,
A kubota snow blower is all you can buy for it unless you purchase a motorized snowblower to mount on the loader using an SSQA plate and extra pneumatic tires and wheels for it to maintain floatation for it as the caster wheels most of them come with are no good in snowpack if you leave snow on the ground.
Regardless, you are going to need liquid ballast in the rear tires, chains and a weight box to overcome any issues with traction and maintaining adhesion to do useful work.
It would different if they being kubota offered a front or rear mount single stage for the Kubota sub compacts but they cost more money to make and the single stage snow blowers made by mkmartin are too large for any subcompact or a compact tractor as the auger is 16 inches in diameter when it should be 13 inches in diameter.
The old single stages I grew up with being the old wheel horse, IHC Cub Cadet and Simplicity Lawn tractors form the 1960's to the early 1990's were essentially unstoppable unless you had thick icepack. They used Kohler and Briggs single cylinder engines with simple belt drives that were easy to maintain and the V belts could be replaced without hand tools. you cannot depend on the current quality of small lawn tractors/lawn mowers made today as they take machine specific metric V belts that cannot be cross referenced to use normal A series V belts UNLESS you have the ALL the pulleys removed and machined to fit an A series V belt.
The only other option I would suggest is investing in a plow blade that you can mount the SSQA plate of the loader and plow small accumulations and then go back with the rear mount snow blower to clear the piles on sides of the road if you plan on investing in a BX sub compact.
You are going to have to drive slowly until you can take a half cut allowing you to travel faster with the BX if that is what you are set on operating.
Unless you purchase a cabbed BX with heat and defrosters your going to have to dress very heavily as it is an open station tractor.
Investing in a used plow truck is dicey and will cost even more money as you still have to depend on the frame being in good shape.
and road legal and you will need to have a beacon on it when operating near a highway where your private road ends.
once the frame starts rusting and has holes in it it is no longer road legal.
If you know you have an honest dealer you will see them behave much differently than a commission based salesperson as they will tell you whether a sub compact tractor will be adequate for your needs and if they are honest they will tell you NO.
A cabbed
B3030 series with, cruise control front mount snow blower, turf tires and chains is what you should consider at a minimum as your going to spend a lot of time clearing snow and your going to get very cold very quickly unless you dress in insulated coveralls, sorrel boots with removable liners and spare hats and gloves in your pockets.
Its a case of buy once and cry once and be able to handle deep snowpack if that is what you have to deal with.