We had definitely considered this an either or contest, so that visual artists aren't competing against wordsmiths and vice-versa. It doesn't exactly feel fair to allow entries that play on both.
I'll check in with the team and get back to you should another option present itself, but in the absence of any further guidance, I would decide how you wanted to be judged, either as a written piece or a visual piece, and indicate your choice in your post.
Hope that helps! :)