Dinah, I did not set out to upset your and no matter how old we are, in gardening there is always something new.
Re-inventing the wheel is not always the best way forward, at times the old ways which are possibly harder work are the best.
We all tend to collect more seed than we need so some loss as we separate seed from chaff will not matter, whilst it is on the board spread out you can pick the plumper seeds out, they seem to germinate best.
Keep looking for better ways, some day you may hit the jackpot.
Frank.