Yeah, that's exactly what I was talking about. I opted against the drilling of a hole (for now). Here is my temp pump setup...
View attachment 4772887
It's far from automated, but I'm still testing things out. I keep that red handle drain closed when I turn the pump on. Then open it when the pump is off. The way I assumed it would work, and I believe I am correct, is that the Air bleed sucks in air when the pump shuts off. But then the main line is filled with both air and water, under a low pressure. When I open that red valve, it drains water and the air bleed starts pulling in more and more air and basically *pushes* most of the leftover water out of the lines. When I do this and wait 5 minutes, I can remove one of the manifolds and look into the main line and there is no water!