That would be a dream, to have excavator attachment. My skid steer is just a toy so I doubt it will ever happen but you never know. This stuff is so nasty, it comes out in large chunks, like digging a pile of bricks that are cemented together. Sometimes the bricks roll into the bucket and sometimes they roll off the lip of the cutting edge. For what it's worth, I've stumbled across another technique. Using the knife hacking technique describe above, it's possible to gouge the surface. From there, I can drop the bucket, slowly rolling forward, so that the skid steer is up on it's back wheels, with the bucket facing down in the cut. From there, I raise the bucket until it's about parallel to the surface. It won't cut much but it will cut a little if I keep the wheels stationary. Then, I slowly roll the skid steer forward while lowering the bucket until I'm well up on the back wheels again. Repeating this cycle, I can tear 3" deep chunks out of the surface and wiggle forward like an inch worm. It's not fast but it is a surprisingly powerful technique. Using it, I cut through and broke up a 5" thick concrete walkway using only a smooth bucket. To be honest, the concrete was easier to break through than the soil.