Hubzilla has an amazing range of features, many of them made possible by the ground-breaking Zot protocol created for the project. Hubzilla is the only app that connects with all the other fediverse apps, by implementing OStatus, Diaspora protocol (and possibly DFRN).
It certainly needs UX work, so I'm excited to hear that the Disroot crew are getting involved with that. My only niggle is that you're already running a lot of services, and the only thing you really need to add is a federated server for OStatus/ ActivityPub (micro-blog). Hubzilla will certainly give you that, but it also duplicates many of the apps you're already running (Diaspora, aspects of Discourse, parts of NextCloud etc). Maybe that means you could retire some apps, but I wonder if you would be better to save yourselves the UX work and the rejig and just install Mastodon?
I am keen to clone the Disroot setup using my Disintermedia.net.nz domain, and I'd be happy to help improve the Disroot playbooks and user manuals in the process, and maybe mirror them on FLOSSManuals.net. My country is also a 5 Eyes country, so not too concerned about US hosting, at least for an invite-only experimental service. If you're keen to collaborate, get in touch: