Radish will stink once they start to rot. Not many neighbors will appreciate that. How about blue lupine. A visually striking cover crop from cotton growing areas. Are your plans to plow the green manures under or to leave the ground alone once the the roots have established? If you do plan to plow is deep ripping the ground alone prior to planting an option?

Firstly, deep ripping would be a problem at this point, I don't have the funds to do something like that today and I have some obstacles(dry well, sprinkler supply lines) to deal with. The last time I disturb the soil(tillage) will be this year, my street has many neighbors with huge trees, I just bought a heavy duty leaf shredder, so when they place there leaves in bags for the city to collect I am going to snatch them up, grind them up, then till them up in the compost/soil layer I have now.

Point taken on the smell from decomposing radish.

I have thought about blue lupine and will probably integrate that into my plans. I think I will find around 8 or 10 different plants, then plant them in bunches separated by either a ground cover or some partially composted wood chips.

So far my options for plants are narrowed to these for nitrogen fixation:

Blue Lupine
Bush Clover
Crimson Clover
Sweet Yellow Clover

Then for organic matter:

Black Eyed Susan
Buckwheat
Daikon Radish
Sunflowers

I am open to suggestions. I will not be planting like it is a field, I plan to plant just several plants of each in bunches, the bunches being arranged so the nitrogen fixers fertilize the organic matter producing plants. I have to make it look sorta decorative not to get the city on my back.

I am not wanting to do any plowing after this season. I am trying to build the soil food web and will even be putting in a path of stepping stones to avoid compaction. In spring I will buy some earthworms from a bait shop then seed my front yard with them. Each year I hope to grind up my neighbors leaves to feed the worms, until they wise up and use them as nature has done for years.

Then the following year I plan on planting three trees, hopefully by then I can get some worms and other organisms breaking up the soil as long as I keep supplying the organic matter.

I will be collecting the above ground organic matter and making some compost for the spring in my back yard, along with any spare organic matter from my neighbors(they are throwing it away). My reasoning for this is my city has an ordinance that weeds that are cut down must be removed withing X hours.

Each year I hope to have a steady stream of leaf mold and plant roots to keep the worms happy.

I have attached a photo of the yard after I had tilled about 3" of compost into the top 6" of soil and had built up some raised beds.

some of my favorite Yarden plants (also many of these are edibles)

viola, or violets
sheep sorrel
pineapple weed/or any chamomile
low growing mints, or big mints
flax, any kind
chicory
red clover
wild onions

ah theres more but thats some suggestions. i have a different aesthetic sense than most, but i think these are all attractive growing wild ish.

dont discount the soil bank, either, the volunteers! it may be bare now...but if you just stirred up the soil a lot and removed grass roots- it should come back with a lot of wild/naturalized/native plants other than grass. you can basically watch it as it comes back...see which ones you like and want to encourage and do a little weeding/mulching on top of the ones you dont want....while you also plant some cool things in the midst of that....

There are some decorative kinds of vetch I saw advertised.

Showy Indian clover is hard to find, but it is a native and thus more "Earth Friendly".

What about Partridge Pea?