Growing your own chicken food.

We live in frost-free coastal NSW USDA zone 10.
We try to get away from commercial chicken food. So far, we get fish heads at our local coop and cook them, the chicken love it!
I have yet to try to cook QLD arrowroot (canna edulis), they don't like it raw.
I know that chickens hate cooked potatoes.
I will try azolla, and BSF and grow more pumpkin.
I planted some sunflowers (I'll see if the birds get them all) and some barley over winter (same with the birds).
I tried to free range but they are a nuissance in the garden and dig too much.
How much of the sunflower and grain can I substitute with alternative feed? How much grain would I still need? How much m2 per chicken would that be?

If I wanted to grow my own chicken food I would do sprouts.

Here are some links that will give you ideas for what others have grown:

https://permies.com/t/366544/grow-chickens-feed

https://permies.com/t/178499/alternative-feeds-chickens

https://permies.com/t/162433/reduce-chicken-feed-consumption

Most things green that we tend to think of as weeds get chickens excited.  See what they peck at most.  We used to grow trays of sprouted wheat or barley when all the green feed dried up over summer.  Tray, couple of layers of paper towel, seed, water and wait.  Serve when about 5 cm tall. Repeat as necessary for a continuous supply.