Turning power off for head rest monitors

I've installed the headrest monitors, I've no got hold of a din DVD player to fit in the boot but the monitors themselves are just screens with a power button on the back so are effectively on all the time with the ingnition power feed.

I'd like a switch up front so I'm in control should the kids get unruly:D I was thinking about using an oem button which could be fitted next to the ESP / tyre sensor switches. Ideally it just needs to be single pole single throw type.

The blanks are there but before I go and order does anyone know if these types would be suitable or not?