There are a bunch of monitors available with single-cable USB-C support, but not sure how many of them have full 85W charging support.
Besides the UltraFine line, LG have other monitors with USB-C, such as the LG 27UK850-W (27", 4K). That one, I think, is only 60W, but in practice the power output is enough (we have a couple in our office).
Lenovo has some, like ThinkVision P27h (27", WQHD), but that seems to be only 45W.
I seem to remember Samsung had something, but can't find it now, so maybe I'm not remembering correctly.