Both Coot and Jeremy at BAS are big proponents of malting the seeds. Sprout them and as soon as they get a small amount of root into the blender they go with water as a high enzyme tea.I've seen people sprout the seeds like bean sprouts, then blender them in water and pour that in, and I know people who toss the seeds, still in the shells, into a blender dry, turn it into a seed meal and cook it into their mix.
I think I'll have a look at the grocery store for bulk sunflower and pumpkin seeds and try them different ways. Kind of like I use my top dressing mix as a top dressing plus a soil amendment plus now a tea amendment.
So, sunflower seeds for P and pumpkin seeds for K. Sounds right up my alley.