Many years ago I remember the Poms had (might still have) a flashing light at airfields that flashed the ID code in morse.
And they still do, or the military airfields do anyway. They are large, red and repeat an identifier (not ICAO, just something logical). They are very useful in the UK where you often have a large quantity of airfields in a very small area - probably not such a problem in the outback of Australia though!