I think im gonna go with the feeding in enclosure method...im not to concerned about taking a bite, (dont get me wrong im tryna avoid it at all cost lol) but all the activity of moving i can see being unnecessary stress. My main concern was the semi-wet F/T mice getting aspen stuck, and my aspen isn't as finely shredded as the kind I used to find.
Afterall its not like you are forbidden to switch methods.