I put the processID into the outgoing form. (could us anything really, just need something unique)
I ended up writing the xml to the filesystem in a folder based on the processid from the intial process. tossed a event to go back to my existing process that I filtered on to ensure the pid's matched from the throw and the receive. I then read the xml from the file system and continued on with my process.
Using contentspace would be an option however the client I am working for doesn't have it.