Bags and bags of seeds, how to get them out of their containing flowers without spending hours.

I've planted loads of phacalia and now i got fifteen bags of seeds coming. Which i would like to re-use to grow a whole field of them close to the bees.
The seeds are in the flower heads, which i can just dump on the soil, but then they all pop up in one place, so i want to get them out! I want to distribute them by hand to get the most out of them. I've got the same problem for lupins, which is the container behind the bag in the photo. I've spend half an hour popping them open, which is not terrible, but it will be the coming year when i've planted all these seeds out and they will have seeds.
Since i got more and more plants that i want to keep the seeds of, to restore the soils and help bees and biodiversity and have locally adapted seeds, i am sure someone else has had the same problem. And come up with a clever solution which doesn't take too much time.
I am thinking of getting a washing machine set up next to the stream, and have the stream tumble the pods around slowly. Or is just drying in the sun and walking over them the way to go or put them in the cement mixer with gravel mixed in. I could come up with stuff, but somebody has better ideas and has tried stuff. I hope somebody wants to take the time and help me and give me some direction.