I'm guessing that this would be a mistake

Beijing would welcome direct US-North Korean talks, the Chinese foreign minister suggested in an interview published on Friday, amid international efforts to get Pyongyang to end its nuclear programme. AFP

We've been down that road before (before Japan decided that it had interests there too) and did not it turn out well. The other players, the ROK and Japan in particular would be unlikely to accept any agreement coming out of those talks. Japan might, but then the fine folk on the extreme right would be rattling on about another back-stabbing by their true enemy, the US.