my enclosure is all aspen as well,I still feed in the enclosure,never once swallowed or ate aspen..but def a good idea to feed out of his enclosure cause BPs stress out an easily,so why stress out an animal more than it should be...hopefully he doc regurgitate cause he gets to nervous.
You ou seem to have no idea what you are doing. But your worried your snake may eat a piece of aspen,that should be the last of your worries,lol..
she he can also be out cause she is looking for a good spot to chill,maybe she is too hot or too cold..my dudes always I'm his hides.. Check your temps and humidity,your snake shouldn't be out as much as he is.