Luke -
Can you wrapper your PGP file in XML? This way you have a known root tag, and possibly some meta-data, for the routing. Granted, this would in turn require some sort of service that would know how to unwrap and send the data (via a processing rule), but if you treat the PGP as a generic payload, and just HTTP or FTP or do whatever with that payload, you could reuse it for any sort of document you want TN to remain agnostic to - PGP, plain text, etc. Just create a document type of “OutboundCanonical” or something like that.
#webMethods#B2B-Integration#Integration-Server-and-ESB