At least a small timing ckt to flash the IR blaster in regular pulses. Your method would be more useful, but it would require adding a speaker to each remote.

At least a small timing ckt to flash the IR blaster in regular pulses. Your method would be more useful, but it would require adding a speaker to each remote. Both require radios of some stripe, though. At that point, you might as well get away from the IR transmission method completely.