Here's an idea (thanks Valerie and Lois):
You can write your message for Tamlin in an email to Valerie (see her profile for her email contact). She can print them out and take them to William when she visits him. Include your Terraforum handle, name and street address/PO box so Tamlin can write (via USPS) back to you. Again, he has no access to the Internet or a printer. He will write back to you.