I’m starting working on an extension that will let you selectively synchronize pages between totally different instance of XWiki. I started a design on https://design.xwiki.org/xwiki/bin/view/Proposal/Instancessynchronization if you want to see more details about what’s planned.
However, I have a hard time finding the perfect name for it, so I’m welcoming any enlightened idea.
So far I’m thinking about https://github.com/xwiki-contrib/sync and
org.xwiki.contrib.sync for the group id and the java package prefix.