so we're in sync about the frame of reference; that's a relief.
Presumably we agree that sideslip is the angle between the longitudinal axis and the relative wind, and that yaw is the angle between the longitudinal axis and the line of travel. With these definitions I agree that a balanced turn has yaw but I don't agree that this has any relevance to teaching someone EoC.
For instructional and pilotage purposes it seems perfectly adequate to teach that aileron deflection leads to roll which leads to bank which by itself leads to sideslip which leads to a yaw rate (because of directional stability) which all leads to ... a spiral dive. Later we introduce adverse yaw and explain that an aircraft turns because of the horizontal component of the lift vector.
AFAIK this is the way its been taught since day one and the average stude understands easily and manages to use the information to fly an aircraft.
HFD