Two mounted lenses? Wow, I have to see this thing, haha.
I hear you about the action shot dilemma. The idea is to have two slightly different angles of the same exact image, right? What if you got two different camera's, put them next to each other, and took a shot at the same time. You could even place them on the setting that takes a string of like 10 pictures in a row for each camera, to increase your odds of success. Just an idea, I've no idea how well that would actually work.