Originally Posted by AirBornOne
...it looks like flaps can be added if you should want more variety,increased roll rate,highly effective TE reflex/camber adjustment and even crow...
I know the OP has taken this fact on board, but it bears repeating again that some old airfoils do not respond to camber change. The Alpina's Ritz foil definitely doesn't, I'm not sure about the Arriba... In such cases a modification to add flaps would be for the purpose of braking only...