Thanks to all who helped with writing and distributing—the finalized letter is available to share as a Google Doc: https://docs.google.com/document/d/1dnpy8IbfPpuhPP6gXXCEPtDXhVxDgtAi0L8GkBTDqcQ/edit?usp=sharing
Please share that instead of this page. Thanks!
The letter has been sent by email, but contact me if you would like to add a belated signature to the Google doc.