When the alarm is tripped, have the circuit engage a large hammer which will smash the toe of the intruder to smithereens. The sound that he makes will probably be just what you want.
There are an indeterminate number of new fathers who might consider giving you their baby-crying sounds when it's 1am ... 2am ... 3am ... 4am ... 5am.
Guinea hens sound like squalling babies. Buy a bunch of them. They make all kinds of racket when there's an intruder in the drive.
Dean