I messed around with a batch of Ed Worts original recipe last year. I did 3 gallons apple juice, 2 gallons peach/apple (all from walmart). With 3 lbs dextrose.
I racked to keg, had a couple or few pints. Then added a 2L of diet sprite. Which backsweetened to a very palatable apple/peach sweet apfelwien. I dont know if the sugar in the diet sprite was fermentable, My wife and I hosted a work halloween party. The majority of the apfelwien hybrid was consumed that night. The rest was consumed within a week or two.
Needless to say, with the diet soda back sweetening. It was very tasty. Coworkers still talk about it. For a 20-30 dollar recipe, and for how simple it is to mix. its win/win.
(I may be drunkerd while posting this)