Italia, my apologies.
You are quite correct about the helicopter blade. (I just went and drew the diagrams!)
However, I think Andy is quite correct about the angle of attack having to reduce to offset the higher airspeed.
You can call it what you like, ie downwash etc, but at the end of the day lift is all about AoA and airspeed, and if the airspeed has increased then the AoA has to reduce to stop a roll.
Yes that is by movement of aileron in a conventional aircraft thus you can talk about deflection angle etc.
You could, however design an aircraft that could rotate the wings independently about their wing spar rather than change their shape.
Such a wing would still require you to have to rotate them to a position giving a lower AoA for the angle of bank to be stable.
No matter how you go about it, in a stable climbing turn to the left,
there is a steady rate of roll to the right, which suggests a higher lift on the inside of the turn, which points to a higher AoA not lower. In a stable descending turn to the left, there is a steady roll to the left.
Lift is simply AoA and airspeed. Downwash etc are just confusions.