DIY seed collecting (grasses & clover)

ive been racking my brain trying to think of a way to seed collect.. on a slightly larger scale using an extra bike i picked up... i found a DIY seed sorter using a blow fan thing .. but now that i can sort the seed.. i said to myself how the heck can i collect them on a larger scale.. do i just mow it up collect it then beat the grass to get the seeds? can i do this all in one.. i know this is a bit random but there has to be a way

Did you ever figure something out? I've been thinking about the same thing!

Based on some Googling on this same question as to clover, I didn't find anything in scale between hand-picking individual clover flower heads and running a specialized combine through a field of the stuff (the magic words seem to be "harvested with a combine using a belt pick-up header" which is so much agribusiness babble to me -- in my head it parses to "a big piece of farm equipment with a belt thingy to pick up the flowers before it shakes the heck out of them to collect the seed". Real farmers are probably laughing now.