Agreed. There is no UR denomination that I am aware of. There is some historical tolerance within the orthodox (EO) denomination. But that's all I am aware of. This is a pioneering gospel work, to reestablish an acceptable theological position from the early church. (as you noted)
Readers may be interested in this below. Which I know you have seen. (ad nauseum - LOL)
"The Encyclopedia of Religious Knowledge" by Schaff-Herzog, 1908, volume 12, page 96 German theologian- Philip Schaff, Editor: "In the first five or six centuries of Christianity there were six theological schools, of which four (Alexandria, Antioch, Caesarea, and Edessa, or Nisibis) were Universalist, one (Ephesus) accepted conditional immortality; one (Carthage or Rome) taught endless punishment of the wicked. Other theological schools are mentioned as founded by Universalists, but their actual doctrine on this subject is not known."