Honestly I tell people that if they're that worried about feeding inside the enclosure (the main fear I seem to see is "what if they eat substrate?") is to just cover a portion of the enclosure with paper towels and feed your snake on them. But as long as it's not a huge piece of substrate they should have no problem even if they do swallow it.

And there is no way in hell I'd try to move my 6.5ft, 25+lb. BCI after feeding her. She's always hungry for more and I like my blood inside my body.