A new switched tower extension ?
Remove plug from socket when you want to turn it off? I can't see what you want existing.
The wife bought some socket timers a few months ago, the switch on the top of them is to either have the device on or on a timer.
Could you use one of those and just don't set the timer to be on at any time, then when it's on timer it's off?
Be warned they make a fair amount of noise, will probably be more annoying than the light on the PSU.that will do !
Thanks for the help