I dont think there are any removable screen protectors. You are probably better off with a case that has raised edges so that things wont come into contact with the screen.
The only thing I can suggest would be something similar to what the iPhone has when it comes New out of the box, is that protective transparent plastic covering would be something easy to apply and remove. Some screen protectors are very difficult to remove once they are applied, which is likely not in your best interest for what you want.