I imagine if you used a dedicated can of balls and only used your racquet tip to pick up or flick or shovel the ball across the court (of course, you should Lysol or Clorox wipe your frame before the match so all can see), maybe it would be okay?
Also, ask your opponent to use common sense and not touch his or her face/nose, mouth, with hands during the match and use disposable towels to wipe?
Thoughts?