Hi Marc
So as you know, it's not possible to import any other content than the ones described in this documentation. There is no available add-ons either, but there is the Confluence API that you could use to build your own add-on; it requires some development.
Regarding UWC, it's actually not supported anymore. I will give you the workaround I found to make it work, but as I said, it's not supported so Atlassian cannot help with this, I just tried to figure out a solution.
UWC only works with previous versions than the current one. The workaround/advice I can give you regarding UWC would be to download a previous version of Confluence here, most likely less than 4.3.7 as written on this archive.
Then, you can implement the UWC and migrate from MoinMoin to Confluence.
Once it's done, you will be able to upgrade your instance, export in XML and import in your current Confluence instance.
Finally, I don't have an extended knowledge in moinmoin, so I don't know what are the type of export you can make from it, but on Confluence cloud, there is a Confluence universal importer that can be used to import various format in Confluence Cloud. then importing this content in Confluence server is very easy.
Please let me know if it helped !
Hermance
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