I have contacted Office Ally, and they confirm that the PDF of the CMS1500 ( without the form ) created by Synapse is a format they accept. To transfer it to OA requires that the file be encrypted by PGP ( presumably Gnu GP will also work ) and then transferring the encrypted file to them via FTP. I presume that they provide those tools ... though if not I can build them into Synapse.
Found that old venerable WS_FTP which can do FTPS, SFTP, and OpenPGP with automated scripting. See http://www.ipswitchft.com/Individual/Products/Ws_Ftp_Pro/Purchase/Index.aspx?k_id=may15off Use promotion code MAYWSFTP15 during checkout to apply 15% off the order. PS: nothing to declare... except that this offer arrived in my mailbox.