I think 90% of people here feed inside of the enclosure and chances of something going wrong from swallowing substrate are like one in a million. Most would advise to just feed in the tank because the snake will feel safer in it's established environment. Moving to feed is stressful to the snake. Imagine having to get on a roller coaster just to get lunch in the sketchiest neighborhood you could imagine. Then to go home once you're as full as can be. Maybe not that bad, but you get the idea.

Many do feed in a separate enclosure and have no trouble with it, though. It's kind of up to your snake whether it will tolerate it. He may not feel safe enough to eat after being moved.

Short answer: you can handle him to move him for feeding, but it may contribute to a refusal.