I'd have thought that was the easiest sound of all!
Why not test it out? I presume you're using a microcontroller of some kind, so get hold of a sample of a piezo transducer that you can accommodate within your product, and connect it to a spare I/O pin (maybe via a transistor to buffer it).
Experiment with a few different drive waveforms - start with a single logic high pulse 1ms wide, then vary the pulse width and the number of pulses in the burst until you get a sound you like.