/icon command to make an icon

When i make a survival. I always want an icon that shows something like me in my house. So then i have to wait in my house till it takes the screenshot. But what i would suggest is a command that also can be used in survival, that takes a screenshot and uses that as an icon. So when you type /icon it takes the screenshot. And that you can also add a delay in ticks that waits the given ticks before taking the screenshot. Like for example when you type /icon 20. It will wait 1 second and then makes the screenshot. I think this is a simple idea that will be great for people that want cool icons. Thx for reading this!