>> now I just put a small plastic chip with the color of the poppy in a bag, pop it over the pod when the bloom finishes and wait.
I like the small plastic chip!
I use small funnels I make from card stock to get seeds into Zip-Locs.
But you don't need to buy card stock if you save stiff advertising cards or the covers of expensive magazines.
I live in a park with centralized mailboxes, and a trsh can right near the mailboxes. I could harvest tons of advertising-glossy-card-stock if I needed more.