The method chosen to use to remove the labels was with a Dremel and a grinding disc attachment. It may be possible to paint over the keys giving a smoother look, but this is messier and the keyboard will be out of action while drying..
There are two steps in this instructable:
1. sanding/grinding the lettering from the keys.
2. fine sanding/polishing the keyboard to make it more presentable
Step 1: Grinding the lettering from the keys.
With the Dremel, grind all the desired lettering. In this step we are not concerned about the looks, but only that all the lettering is removed. However, don't grind more than needed as noticeable indents will be created.
Step 2: Finishing the keyboard
To give the keys a more even look, simply grind lightly over the entire key. This will produce an even rough look to the keyboard. A soft sanding block was then used to further clean the keys.
If desired the keys could be further polished with finer grade sandpaper and then a soft polishing wheel. But I didn’t bother.