Too Low - Gear
An early poster suggested that if the "Too Low; Gear" warning had been in Spanish, the accident might have been averted.
Surely there is a simpler solution. "Too Low; Gear" and "Too low: Flap" both have the same number of syllables. In years past, the RAF determined an unmistakeable instruction from the bomb aimer. To turn to port, the command was "Left, Left" ie two syllables. To turn to starboard, the command was "Right," just one syllable.
Why not change the warnings to: "Too Low, Flap" and "Too Low, Landing Gear." The disparate number of syllables should then alert the ICAO Level 2 English speaker to the imminent danger!
Remember, ICAO Level 4 is only a requirement for international flights.