Hello
Are the ground almonds blanched, as in no skins? It looks like most ground almonds contain their skins whereas almond flour doesn't. I'm not sure what affect that would have on your baking if you managed to grind them up fine enough for flour.
Also, I'd imagine there would be a good bit of oil in the ground almonds that would cause your flour to become quite clumped together?
All the above is just guesswork as I've never done it. But I'd imagine getting the ground almonds fine enough for flour could be a very difficult and long process.
Grant