The purple pollen from one plant needs to be brushed onto the center of another poppy, right? And I would need to isolate the pods as they are opening so the bees don't get them first? And also cut off all the pollen from the pod parent? This is just my guess about how one would go about it. Anyone here ever done it? I have googled till my eyes crossed, but couldn't find any information.
"Of course, you wouldn't really be hybridizing; you'd just be crossing varieties."
Crossing varieties is hybridizing. You don't have to be crossing different species or genera to be hybridizing. In fact, I think that most of the commercially available F1 hybrid seeds are crosses within the same species.