For his final project for Corey Earle's class, graduating cowbell player Matthew Furman created a podcast episode about the bell. Not a complete history by any means, and I'm not sure if he was able to connect with Age or Ari or any of the others, but he did speak with four of us. Enjoy.
https://drive.google.com/file/d/1-SzQRjloFQ16PDqvbSQZ60iNPxtRHLeG/view