Another 3 things that could be helpful:
1. I know the owner of the business who is building their new med school building and he has subcontracted heavy equipment work to me in the past. Do you think this would be a good person to ask about a letter of rec or to send an email on my behalf?
2. Another one of their undergraduate professors I know well through work, he has inspected my work as he works in my industry too and we are pretty chummy. Could ask him for letter of rec too or ask him to put a good word in?
3. I've worked extensively with a department director of the local health dept in my work and he could speak to my work experience as well, tying it into public health.
Would they be impressed by this or turned off? Idk what these people want to see, help me please lmao.