The bane of many gardeners.

some species, the females are born already pregnant. and some forms can choose when to have MALES too. i do think thier are parasitoids that can deal with aphids.

That is a very interesting device. I would love to see more information on it. Inventing is a very difficult thing. You have to do engineering, product development, manufacturing, marketing, and many other specialized functions. Don't give up. You probably will not be able to make money until the design is refined into a final product. But the challenge and experience of going through the process of developing a product would be more valuable than the profit. Don't forget to protect your design with documentation and possibly patents. Maybe you want to seek financial backing. Check out sites like Crowdsupply and other crowd funding sites. I would gladly help support your project since all the crossview pictures I create are taken using the "cha-cha" method. I would love to have simple device to automate the process. Good luck. Please keep me updated on your progress.