Once you break the sugar free from the fiber, there isn’t a way to undo that by just adding fiber. It will slow down absorption some, but not nearly as good as just the whole fruit. You’re still getting a massive GI spike
Will delay stomach emptying. Good for insulin sensitivity and keeping blood sugars stable. Still not good for the liver as the fiber is external to the sugars in the apples. The liver still perceives the drink as a refined carbohydrate. (Source: comments by hepatologist Robert lustig)