Everything is looking good, as always.
Is the Azatrol working well as a systemic? I always worried it wouldn't be enough, but if it stops them eating, they will die I guess.
How many amps or watts per line are you wanting to switch? I understand that you want to have each line remain isolated, power-wise, am I right? And there are only 2 circuits, right?
What you need are a relay, a bit of wire, 2 short heavy duty grounded extension cords, a plastic box and some screws. You can get relays that will switch 120V at 8A safely with sockets for $16 each at Fry's. If that is all the power you are pulling through them, you could use those and have something for under $50 probably.
You would end up with a box with two cords for in and 2 for out. One plugs into a regular timer of any sort you would use to switch lights; the timer plugs into circuit A. The other cord in just plugs into circuit B. When the timer turns A on, it also energizes the relay, turning B on as well. Each extra slave circuit takes one more relay and one more extension cord. All circuits are kept separate.
I could walk you through it. I'm not an electrician, but we could even adhere to the electrical code I think.