I have the type cover and always cringe a little when I fold it all the way back and the keys are resting on the table. I know that over time it is going to get all scratched up.
This is a great solution that I would have never thought of. Although, if I have to detach it to turn it around, 9 times out of 10 I'll probably just leave it unmatched
But, I will do this if I'm worried about forgetting the type cover, have nowhere convenient to put it, or am worried about scratching the back of the surface on a dodgy table.