Dave,
May I respectfully ask why?
Sure!
It's because the easiest thong by far is to just shut down the engines or start them up. Your way is a lot of work for no practical gain, particularly since you'll eventually complete your control panel and use switches instead of tiring up an AIU port.
In the mean time, just cobble together a piece of wood with 5 toggle switches on it. Place it where the control panel will be and, after the panel is built, simply move the 5 switches to the panel, reusing the wiring.