while I can't think of any legitimate reason to cohabitate three entirely distinct species simply because they have vaguely analogous husbandry requirements, I think I'll refrain from further comment.
skiploder, after I add a few womas to my collection, indigos are next up on the list. I hope to bend your ear in a few months if you can spare a few minutes.
p.s. to the OP, independent of anyone's opinion regarding feeding in a separate enclosure, you shouldn't worry about your snake ingesting a little aspen. no cause to worry on that account.
Just shoot me a PM. I have a Power Point presentation I can send you on Drys in general. It covers most of the basics.
I remember the days when adding a pair of womas could set you back about $3K............