Maybe the difficulty in "choose your endin" PBs, is that a kid loves a PB because he knows the ending, if that makes sense. He/ she wants to read over and over again the same book, because he knows how it ends. Maybe for an older audience, like kids that just started to read but still do enjoy picture books being read to them, like 6 years old, that could be fun.
Have you considered a book with flaps, so the kids could decide to turn the flap or not?