I have no idea what is available for the BX series, but my two cents says the diameter of the tire and the weight of the tractor are determining factors in what you can pull around. With a rear blade you are always pulling in the untouched snow. When the load on the blade gets too much, you are moving sideways, then stuck. The tractor cannot then easily climb back over the load of snow to get free. Often you cannot raise the blade high enough to clear the top of the pile, and you are really stuck.
So I tend to push backwards on the rear blade, and it always tries to dig down in too far. I have put a gauging wheel on the blade to keep it out of the gravel, whether I am pushing or pulling.
I'm using the L3200 with filled tires and chains all the way around, and a 6' Rhino blade. I can generally make a pass in each direction, then try to offset the blade a bit and move the birm farther over. After that, the tractor still goes a bit sideways. I often end up pushing backwards to knock the snow off the driveway.
So, your tractor can easily handle a 60" blade on dry ground. In snow it becomes a matter of traction and weight. If you are going to end up pushing a lot, it is much easier to do it running ahead than backing up. Then I do the job with the front loader. If you float the bucket with a slight upward angle, the loader works fine.
I tried building a blade for the loader of my old 185, and found the geometry all wrong for it. The attachment to the tractor is pretty high up, so the tractor lifts in front, and the blade digs down. Trying to feather it never seems to work. You have completely lost steering and control. I don't recommend it.
If there is a reasonable adjustable dozer blade for the BX, I'd look at it seriously. It could well be the best answer.
I'm not trying to be discouraging, but snow removal can be that way. A lot depends on the length of your drive, hills, etc. Mine is both long - about a thousand feet, and hilly. There are places where you don't want to slide off of it sideways.