Aren’t they only palatable in spring, when still mild and tender? Asparagus and Russian kale seem more practical… a tree takes a lot of space. In spite of a low of -9F the kale growing near my house started providing edible leaves about 2 weeks ago. In my climate it is self perpetuating. A large bed of asparagus can provide two pretty lengthy harvests if you allow half to mature without harvest through spring and then cut down in early summer and harvesting the new shoots that come up.
Actually, cleaning the seed of sorghum is one of the easier ones! I put mine in a pillowcase and go to town whacking it on the ground or a chair. Since the sorghum is a good size you can get away with putting it through a proper sized colander to shake out the chaff…