Not on UA metal. But if you are willing to fly out of JFK, yes to the lounge (
Horizon T7). Obvious the schlep won't be worth the hassle if you are based in NJ.
ANA give its Prem. Econ. pax on its own metal lounge access. I believe there are only four airlines in the world that do this (JAL, Avianca, and one other I can't remember).
See, for instance, ANA's lounge access pages,
incl. this one for United Club at ORD
At other airports, the choice differs, but there is one listed for each of the U.S. airports I checked, as well as for both HND and NRT (unfortunately, nothing at KIX).
So for pax willing to pay cash for Prem. Econ. to Tokyo, flying on NH metal (on a code-share ticket from UA or otherwise) could be a good choice.
Personally, I'd fly PE to Japan on ANA (on a code-share) and back to the U.S. on UA (hoping to get an MUA upgrade).