Evan,
I won't let mine get down to freezing but I've heard that in native habitat it may experience cool temps but not freezing. There is an aroid (genus Peltandra) that looks a lot like it but much smaller, and which grows in places like Virginia. If I could cross Typhonodorum successfully with that plant (even if the progeny turned out sterile), I'd be home!
Musarum? Yes, exactly, although Musarum is the ultimate in banana-aroid fusion. I'll need a transgenic lab before I can begin work on that one.
LariAnn