To be honest I don’t think a wrong’un needs to turn much, even if it’s literally just a top spinner that can still be very effective.
But I did see, on a off spin video, someone talking about the wrist “breaking” as you go to release the ball when bowling a doosra (essentially a reverse leg break, back of the hand faces the batsman but your wrist is twisted in the other direction, it’s incredibly hard to do). I’m also incapable of bowling a wrongun that isn’t just a leg break with lots of top spin, but I think it might come down to how well you hold your wrist position. So basically you might have your hand in the right position for a leg break but right before you release the ball your hand snaps back around into near it’s natural position.
This pretty much happens because your hand isn’t really supposed to be bent in the direction you need it to be for a wrongun/doosra. I honestly have no clue how you would fix it other than concentrating really hard on keeping your wrist in the right position.
Yeah, I guess it could be thought of as a top spinner variation with the ball going inside a bit.