In a completely hypothetical situation, would a Drive Coach legally be permitted to utilize a bagpipe as a signaling device to the human players? It certainly seems to me to be legal under H303 as a “non-powered signaling device.”
Given that Wikipedia thinks “Bagpipes are a woodwind instrument” and “Woodwind instruments are a family of musical instruments” whereas “A musical instrument is a device created or adapted to make musical sounds.” we can eliminate a “noisy device” from the equation if you introduce the bagpipes not as a musical instrument (as there is no intention to play music using them) but as a signalling device.
That leaves us with the “noisemaker”. That one should be pretty easy as well given the definition from Wikipedia: “A noisemaker is something intended to make a loud noise, usually for fun.”
Since you’re not doing this for fun you could argue that it would be at the very least highly unusual to consider bagpipes a noisemaker.