Run just the poppy seeds through the mill, but no need to make a fine flour out of them, use a coarse setting.   Since poppy seed desserts are common here, there is a coffee grinder at the supermarket just for poppy seeds  (at the bagging center).  If you have any other kind of grinder, or even a blender, try it. The other ingredients can be added later to the warm milk or water. 

The first time I looked at ground poppy seeds, I thought nothing had happened also, then I looked very closely and noticed the outer shells had been cracked, that's all it takes. 

Mini O

I am wondering if you used your Champion Grain Mill for your poppy seeds and how it worked.  When I saw your post, I have to admit I cringed.  I use my Champion Grain Mill attachment all the time, but I have always used a little electric grain/coffee mill for my poppy seeds, since they are so sticky.  Poppy seeds may even be one of the those things that are expressly forbidden to be ground in the mill by Champion.

 I, too, traditionally make a poppy seed roll for holidays.  It is a major pain to use the tiny capacity coffee grinder when I am making large quantities, but I haven't found anything else that works.  I would be terrified of using the Champion mill b/c of jamming potential and clean-up nightmares, and the larger food processor I used to have just spun the seeds round and round.

Esme 

I've got a Matstone juicer - similar to the champion I think - but also not sure about using it for poppy seeds. Does a coffee mill work?

Andrew