No reason not to grow your organic matter/compost right in place to improve your sandy soil. Some cover crops and even "weeds" are good at extracting otherwise unavailable nutrients from soil and making it available to the next generation. Pigweed is an example of a weed that is efficient at making soil phosphorous available. Sometimes you can work with the weeds that you already have, just chop them in before they set seed.
Buckwheat... did I hear you say you want bees? Nothing like BuckWheat Honey! Buckwheat is a fast growing, high biomass crop that is an important green manure. Just go buy some whole buckwheat from the groovy food store if you can't find another seed source.
Clovers would be another one that would be good bee food and also is a nitrogen fixer (free nitrogen from the air)
Hairy vetch is another legume (nitrogen fixer) that is vigorous and will smother undesirable weeds. It will also reseed itself in the right climate.
Remember that with green manure often you want to chop down and incorporate into the soil before it goes to seed so that it will not compete with a subsequent crop.
Chickens will "fly" amazing distances! Don't have chickens right now but they used to fly up in a tree when the coop door got shut by accident and it was time to go to bed! You can clip the primary feathers in their wings but it is a pain in the neck and you have to keep on it. They rarely got over a 5 foot fence but are very opportunistic about finding things to hop up on so the fence is shorter! I have also seen them dig _under_ a loose fence. You might have to put them in a coop or make a rolling coop that you can move around the lot so they always have fresh ground to scratch on.
If you are interested in any of that or more I can help you find seed sources but you can probably get just about anything locally...
Cover crops are great to experiment with and find what works for your location and soil conditions.
Cheers!
Agony
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