I've got an attachment that spins laterallly like a top, rather than up and down. I have no idea what the technical term is, but I call it a "ripper" because it tears up untilled ground. Then you switch to a tiller, disk, harrow, or whatever. I push mine with an old gravely but I suspect others make similar equipment.
Breaking the ground isn't really all that hard if the dirt is there. Kill what's growing there (roundup) and then you can break it up with about anything. I once spilled a bit of the turnip bag trying to load the seeder. Turnips sprouted on the gravel there... they will grow, literally, anywhere.