The puny little DH8-300 had something rather similar but more refined than a pure AOA indicator installed. On the left side of the horizon, there was an indication similar in looks to a GS display with a diamond. When centered, the aircraft was at 1.3 Vs = an appropriate approach speed; higher or lower speeds were shown by the diamond moving up and down.
This was a beautiful and technically rather simple fallback alternative, should the airspeed measurement give grounds for doubting its reliability. One would think that with modern EFIS aircraft this might be easily programmable and a little corner on the PFD (maybe to the left of the ASI, similar to how the VSI is often crammed beside the altimeter tape) might also be found to show this.