Thanks for your reply! I still have to visit the guy and ask what he has available.
I'll do that somewhere in the future (next month maybe - since I have my supply ready now) and adjust my plans accordingly.
about the rice/paddy. That's not actually rice grains like we know them ... They look like this:

The wheat is used mostly to germinate overhere in Belgium. But I don't give germinated food since it spoils to fast. This is what it looks like :

I do think the broken corn seeds are hard, and I was probably going to cut them anyway. But if they don't get eaten if I try them... the chickens I have will be very happy
sunflower is commonly used in budgie mixes overhere but in very small dosages. And it's the first thing they go after (likewise for the cockatiels)