After doing more searching this afternoon, I'm just going to put in a switch. I found a micro-toggle in my bottomless box of parts, so I'll just wire it up tomorrow when I get ready to install the headunit.
Ran all the wires today for the amp and speakers.

I didin't think it was going to take as much wire in the c4 as it did, used close to 40ft.
Tomorrow I get to mount the amp, finish installing the interior and get started on the baffles for the speakers. Hopefully I'll get all that done and the front baffles in, so I can put the door back together before I forget where everything goes.