I don't use laying pellets b/c they dont have the 16% protein level that chooks require. Unless you know how much protein your scraps contain, laying mash will be the best thing for them as a supplement. No, it wont be organic unless you can source organic feed grain. I will look at buying a 100kilos plus soon from an organic grower in Qld soon to see if its feasible to buy organic seed for them. I feed mine a mix of scraps and grain as its important to keep the chooks healthy than skimping on their dietry requirements!
If you are able to; try growing vegies and fruits that are easy and high in protein as well as grains like Amaranth which are dead easy to grow and self seed. I imagine the person at the feed shop should be able to sell you seed that you can sow yourself(thats what i did), things like grains and grasses that are high in protein etc. You can grow things all round and will give you mulch as well as organic matter to dig into your garden beds at the end of it. A bit of research will go a long way in getting it right. Perennials like Pintos Peanut can be established and used as a free range pen from time to time also.
I grew my own wheat and amaranth at my last place and found it quite easy. I did it to see how hard it would be without taking up a lot of effort on my part. I cant tell you how excited the chooks were when they were released into that area once it was ready :p
Oh well.... rambling now.... but it was a chooky Q
Township of Boonah (pop 3,000)
2.7 acres of gently sloping volcanic soil
"Progress is a spiral; the pendulum swings back as well as forward. The new postindustrial world, for which many of us are striving, will see an ecological renaissance".... Rober Hart