I am not sure if I am missing something but I don't think I am able to bypass my water heater with my setup. This leads me to believe the only effective way to winterize will be to fill the entire system with antifreeze and pump it through. I think I will just add another shutoff valve to the hot line as well.
So looking at the attached photo I am not really sure how the bottom valve works but I am thinking one of two ways. 1. It could close both lines completely then I get no antifreeze in any of the hot lines or 2. it only closes the path to the cold and the antifreeze can get though the hot lines but in this scenario it will also fill my water heater. In the photo attached if I switch the valve the water can still back feed trough the hot line.. Unless my water heater has an anti flowback valve on the hot line?