I struggle with similar conditions in Central Oklahoma. And I refuse to buy soil, except for a tiny bit of potting soil when it goes on clearance in the fall.
As you already know, we can't just shovel up the
local dirt into our raised beds, or it will bake into lifeless
concrete cubes that are even worse than the
native mineral ground. But I have found that it's impossible to get
enough volume without using
some local mineral dirt. So I have evolved a number of cheats. All of these are slow, evolutionary, multi-year processes.
When I build a new bed, I start by digging out the dirt in the bottom and throwing in as much old wood as I can, then putting the dirt back. Then I'll fill the bottom third of the bed with a mix of wood and mineral soil. Over years, this will settle down as the wood rots, which is why I always need to be adding stuff -- organic matter by preference, improved mineral soils more commonly.
I build my beds tall. This gets them up out of the zone where rats and
rabbits and gophers and
moles and voles are comfortable operating, and into the zone where weeds and pests fall comfortably under my eye and hand. (I'm tall and don't stoop easily.)
In the bottom half of the bed I'll put anything organic that grew on the property, I'm not fussy. I don't worry much about alleopathy, it strikes me as an overrated concern. I have a lot of Osage Orange trees, so the "horse apple" (woody grapefruit-sized fruits) they drop are particularly easy to collect by the hundreds of pounds; I use these a lot buried deep in my beds. (Too shallow and I would get seedlings.) Leaves, fresh or old. Forest duff. Twigs and sticks. Dead weeds. Brush hogging detritus. Anything. Mixed about fifty-fifty with the local clay-heavy "red dirt". As I get closer to my planting layer, I put more effort into going out deeper into the woods and breaking down old fallen hardwood trees, scraping up all the decomposed wood (the little cubes of dry rot) and the organic-rich matter around and under them. But that's hard work and there's never enough.
As a sort of compromise layer, I watch for gopher holes. Gophers do a great job of digging out a soft, sifted, aerated form of my local dirt. It does a much better job of filling containers and beds than anything I can dig myself. One good fresh gopher mound shovels into a five gallon
bucket.
But all of that is the "hurry up" part of the project. Then there's the long game. I'm always wanting to plant something in a container for which I have no soil. Inevitably I sigh and "make do" -- which means, I take my container (usually a salvaged five gallon bucket) and fill the bottom half with fresh greens (weeds or leaves) and the top half with raw mineral dirt. I'll use a little compost or fertilizer or whatever I've got to feed whatever I plant into this doomed arrangement, then mulch heavily on top with fresh comfrey leaves. Then it will grow however it grows that season -- usually badly due to the lack of good soil in my container. But that's not the point. Over the growing season, I'll get enough soil life going to break down the green stuff at the bottom, eat my mulch, and shoot
roots through the whole shebang. After my plant is done, I've got a bucket full of something that looks a lot more like "real soil" than the shovelfuls of mineral dirts I scooped into bucket originally. You couldn't (wouldn't want to) plant back into that bucket, but every winter I go around and tip all those makeshifts into the tops of my raised beds, which have all been settling. They usually come out as bucket-shaped chunks of hardness, which I have to whack apart with a garden tool, but when I do, it crumbles into crappy soil, not pure mineral dirt; there's organic matter in it now. It's not beautiful, but it's way
better.
I do a similar thing with water chestnuts, which I grow everywhere in small containers full of raw dirt and water. They don't grow big enough to be worth eating if I don't give them good rich soil for starters, but they do absolutely convert red dirt into grey/black mucky organic-rich earth and
root masses in a single growing season, while providing habitat for dragonflies and frogs. Then I dump those containers into the bottom or middle of my raised beds for next year. (They will send up weedy reeds if I use the root-filled masses too close to the surface of my beds.)
Hope this helps!