You have made my day once more. THANK YOU, THANK YOU, THANK YOU!
I sincerely hope to be able to buy you lunch one day! Heaven knows I'll never be able to repay you with any FileMaker tricks.
FWIW I open PDFs in the Notability iPad App, make annotations, and then send the PDFs out using Notability's built in sharing by eMail feature. If the addresses are in your contact list, they come up very easily.