I uninstalled the version from calibre-ebook.com, and installed the version in the AUR. All working now -- it looks like the packager took care of enabling GTK themes already.
Unfortunately, using the downloadable version from calibre-ebook.com didn't allow any changes to the look whatsoever; if anyone reading this is on Arch it seems the packager is staying fairly well caught up -- the AUR has version 2.16.
As always Kovid, respect for your time and attention, and a great application.
Aloha.
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