How to MySQLDump with For Channel to set up multi-source replication?
I raised this with Oracle BUG 96072, and they have responded with 


  "I have analysed it and I consider it a welcome feature request."


So I am taking it from that, that this is an oversight, and there is currently no option to use mysqldump to build a multi-source database.

So for the moment it seems the options are:


Export MySQLdump to a file, then manually edit the file, before importing it again (needs twice the space and twice the time)
Import the first database, remove the replication settings (saving for later), import the second database. Update the replication settings for the second one, then start replication on the first one. Also far from an ideal situation.