May I suggest spoken TAWS alerts are considered?   A subset of warnings given by Ground Proximity Warning Systems.

I don't know how much work this would be. I guess they are audio "clips".

This is a subset I don't think needs aircraft system interfaces:

"Terrain" - When "red" terrain is ahead (time user setting)
"Terrain, Pull up" - When the terrain warning is ignored
"Sink rate" -  Excessive descent rate (user setting)
"Sink rate, pull up" - When "Sink rate " is ignored
"Don't sink" -  Altitude loss during  take off climb out

Not a GPWS term but useful:
"Fife hundred" information message when approaching a destination runway.