Or do like I do and use sand for bedding and the little ones can use the sand as grit. Of course I live on a sand dune and the sand is free.
DIY Feed that can be grown? - Page 2
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Sorry, I don't understand what 'stage feed' is, but here are two videos that may help you make your own fodder (feed grown from sprouted barley or wheat seeds). They also have recipes for the complete chicken feed that 'won't break the bank'!
Here is the video recipe/fodder recommendation:
Here is a video on growing fodder:
I hope these videos help!
Baby Chick Farm
I looked at the sites you listed and found them very interesting. I started a seed sprouting tray today to see how it turns out.