Delaying it for a month would not be much of a concession. In fact it would ratchet up the pressure because if there is no deal then the exercises proceed.
Don't think you understand Asian culture. Any delay would be a sign of weakness in both China's and the Nork's eyes.
The drills should proceed unabated. Show both China and the Nork's who's the boss here.
Exactly. Trump should board Air Force One on the pre-agreed date, with the announcement "I'm headed to Singapore. I fully expect Chairman Kim to meet me there. If he chooses to not show up, I will take that as a sign he wishes to have all current sanctions remain in place, if not increased."