Ewww that sounds ugly man....
That's always a rule of thumb when building a cab, is buy a tv the remembers the last power state on shut down, so your smart strip works to synchronize your PC with your screens at power up, as long as the tv's are on at power-up windows will remember what TV was set to which via the port.
You can easily test this by turning on the tv, unplugging, and then plugging back in.
Also instead of hacking your TV up, one of these would of worked just as well.
coupled with one of these
I have the eye mounted nicely in the cab, and can control my sound system, backglass, playfield and 3rd screen monitors.
Every blue moon, the TV's lose power state, all i have to do is point to the eye and turn them all back on. This is also my volume control without having to open up the coin door.
Get you one of these too if you can...pc plugs into blue, and tv's into green, red is for always on peripherals. Once the pc is turned on it turns on all devices plugged into green and when pc shuts down it powers down all devices plugged into green.
You would just have to set your bios to ensure the PC is totally shutting down and not set to power saving idle state.
One momentary switch wired to power on your mobo and now you have a one button all on solution.