All my snakes have been fed in their enclosures for as long as I've had them, and I've never had issues with cage aggression. In fact, I'd say that you might actually increase risk of being bitten by reaching in there to remove the snake on feeding day.

If he wants to eat in his enclosure, then feed him in his enclosure. I'll bet you 100$ that you won't encounter any cage aggression because of it and besides that it's best that he just gets food in him, no matter what.