I think sticking to the original aims and not having a serious dose of 'Mission Creep' with the exception of capturing a logical buffer zone at or just north of the 38th would do it.
Perhaps some encirclement ops but nothing like the invasion of Pyongyang with all forces eventually retiring
Then Dig in and make efforts to Jaw Jaw (involving all the players) rather than War War.
I'm no expert, but I can imagine that being politically difficult given that China had only just been "lost". Status quo ante in little old Korea is not going to look terribly impressive to everyone concerned.