Live Chroma Key with Multiple colors?

Hello Everyone,

Fair Warning, absolute beginner here! I think what I want to do is fairly simple. I followed this tutorial by John Reed to get live ChromaKey effect and it works great! (https://www.youtube.com/watch?v=lS3_lNXskMw).
Th final output is a little bit slow on latency but maybe that can be improved somehow later?

I am doing a live performance where I'd like to key 3 separate colors simultaneously, have a different video behind each one that all play simultaneously with a master "Play" button. I'd like to send the final image out of a projector attached to my computer. Looking for some help on this:

- Add two other chroma keys for a total of three colors keyed simultaneously
- Add two other video players that play under these other keyed out colors
- Add a universal control to play/stop/restart the three separate videos simultaneously
- Output the final video to a separate screen to be projected
- Ideally (though last on my list) to improve the latency so this effect is more realtime

Any help on this greatly appreciated. Here is a screencap of my workspace currenty

Thank you so much!