The AoA meter will always be accurate as it measures the only parameter which the wing cares about, the angle of attack. The speed is irrelevant an the ASI only 100% accurate at one set of loading and atmospheric conditions.
If presented in analogue form you would still mark the AoA with Vs, Vx, Vy, Vfe, Vno and read it in exactly the same way. You could also add a scale which would give an approximate speed deviation.
Of course there would be circumstances where the system would not be relevant, for example, aerobatic types where high speed, zero wing loading would confuse the instrument.
One should bear in mind that best climb and best angle speeds vary not only with weight but with altitude.