This is already happening and I'm pretty sure there are Trump branded products in some third world countries. Just like there were Hitler fireworks and waffles in some Arab country. Also in the future some fast food chain might name a sandwich for example after him. A sandwich consisting mostly of carrots lets say, cause you know, they joked about his orange skin color.

Trump himself could easily enter the fast food industry by purchasing some unsuccessful but relatively developed business and refinancing it with his own money. In fact as far as I remember he had his own stakes restaurant in New York and personally starred in the commercial, claiming his stakes were the best there is.