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)