These are beautiful, full of variety and great poetry, not merely a show of virtuosity for the left hand. I assume they were written for Paul Wittgenstein?
You don't need to. That's the thing. It's like looking at a two hand piece and asking "what if you play a note with your nose? Do you get in trouble?" and the answer is no - but it's not necessary, because a good composer takes exceptional care to write something that you can play well with one hand.
