Looking at the image, if you take away the middle voice in the right hand, it's nothing you can't do. All the triplets end on the G.
You could practice your scales in octaves using your fourth finger on the black notes. It's something that any teacher would tell you.
How about take away the middle voice, then when you're used to it, you can add it in? It's how I would practice this passage.
How long are your hands? My left hand can play a 10th whereas my right hand can only play a 9th.