Setting alarm on with a single click
Buy a Samsung S3 - it alarm app has a built in widget function that allows you to set a widget, and then assign the alarm you want to it. Its a 2 block widget and you can toggle it on and off, plus it provides details about the alarm.

Perhaps you could see on XDA if someone could pull the app for you and then you could try running it on ICS.

I am surprised there isn't another app out there that is similar.