Well, I can't seem to reclaim the universalistchurch.net domain, despite my repeated appeals to the registrar. (I don't have access to either email address with which I registered it aeons ago.)
But I own universalistchristian.net, so after some tinkering I've moved the site dedicated to the "Christian hope in the final restoration of all souls, and those who believe it" there. It's largely historical and liturgical material.
But this episode has shown me the limits of WordPress for what should be a simple site, so I plan on converting it (with all the text) to a simpler, easier-to-maintain and (I hope) faster loading platform like Pelican. And now that I have a functioning site, I can try.