Haven't read this whole thread, but thought I'd throw my 2 cents in.
We just got about 16" of lake effect snow here in NY and I had no trouble clearing it with my Kubota
B7610 (24HP) with FEL, loaded turfs, a Woods RB60 rear blade, and NO chains. I normally clear four driveways; two of my own, about 150' each and two neighbors, both 100' or less...all are flat, two are paved.
This combination works so well, I keep putting off the snowblower that I intended to buy. With the right angle on the bucket, the FEL makes a very effective snow pusher for getting accumulation out of the way; while the rear blade lets me get down to bare pavement.
Beyond 4WD, the key seems to be the fluid in the rear tires and the fact that the RB60 can be allowed to float on the tilt axis. Cheaper rear blades don't allow this, so if the tractor is tilted (side-to-side), so is the blade....potentially causing the low end to dig in. Floating on the tilt axis allows the blade to conform to the angle of the plowed surface regardless of tractor tilt. The RB60 is more than a KK or Howse blade, but at $450 plus tax it shouldn't break the bank....and it'll be more help than carrying a box of rocks back there.
On the unpaved drives and when I wander off the side onto the grass, the rear blade will, of course, dig in if used normally. If the ground isn't frozen hard, turf comes up. But if you back into the snow with the convex side (rear) of the rear blade moving forward, you ride up over the gravel and turf doing little or no damage while still clearing the snow.
I have a larger 4WD tractor with 7' blade, FEL and loaded Ags. When I first saw this recent snowfall, I thought I'd need it for sure. Not so. The little
B7610 had zero problems and did an excellent job. What you're proposing should be easily possible with the right rear blade and some fluid in the tires.
FWIW
Bob