They won't be able to claim it as theirs because you'd label all the food in English and Korean. With a picture of people of different ethnicities hold hands and smiling.
Oh, also you'd drop appropriate medicine as well, because many NK's are riddled with parasites.
Again - do we have any evidence that this might be true? From what I understand, the NorK true believers are actually true believers. I have a friend, nominally intelligent, who has decided to become a flat-earther. (I don't know why). He is immune to evidence at this point. It's the weirdest thing you ever did see. Do we have any evidence that the NorK military would be any different?
FWIW - I do admire your optimism.
It's a tough choice. Dropping large amounts might get military action. Kim could say it's food today, but they will start dropping poison to look like food. The medicine is ok now, but it will be poison next! Shoot it down! Burn it! I think these poor folks are so brainwashed it will take a long time of systematic kindness to make a dent.
Other communist regimes exiled your entire extended family to prison camps for such things. Do this for 50 years, add propaganda night and day and what you said doesn't happen.