would an AOA indicator be helpful in a glider?

I am not a glider pilot, although I have been up with friends a few
times in the past, but I know the basic instrumentation is pretty
limited- and for good reason. However, would an AOA indicator increase
the efficency of gliding enough at best L/D, min sink and other
specific angles of attack enough to justify installing one? KIAS is
only an approximation of a desired angle of attack for a given weight,
so would a precise AOA indication be beneficial for glider pilots? In
most jets, speed tapes, stall protection systems and pitch limit
indicators are all based on AOA, and fight without them would be much
less efficent and safe. If there were a device to accurately display
the wings current AOA in flight and only cost around $100 would anyone
be interested in installing such a device. Thanks for any input or
opinions