Need help designing an ultra-low-power acoustic trigger for a muted doorbell

My painter accidentally painted over my doorbell receiver, which has now drastically reduced the volume and changed the distinctive "ding" sound into a barely audible muffled "finger flick-like" (approx. 30dB).

I know the simplest solution would be to replace the unit or remove the paint from the metal parts, but I'd like to approach this as a fun DIY science experiment instead.

Here's my idea: I'd like to install a small acoustic sensor inside the doorbell box that can detect the faint "finger flick-like" sound and trigger a secondary device—like an additional chime or bell—to sound instead.

My main question: Is there a passive acoustic-sensitive device that can act as a trigger? If a purely passive solution isn't possible, I'm open to something with very low power consumption, as I'd prefer to avoid a complicated or power-hungry circuit.

Any suggestions for components, circuit designs, or approaches would be greatly appreciated. Thanks! 🙏

Here’s the photo of my doorbell internal with size D batteries..

The cover which is not seen here has about 2.0cm space.

https://ibb.co/LdYVF6KL