I love it and will be making this sometime. As I love cooked apples as they are, I never add sugar to them, but as you stated, I use different apples for more sweetness of less.
I also make apple pies similar to this recipe but without the juice. I use either plain water or coconut water instead. Although I've never tried to make gluten free pastry, so thank you @thouser for the recipe. I will enjoy giving it a go.