kernel modules dont get stripped, so splitting their debug info out isnt useful.
So that we don't have to hardcode the /lib/modules path, maybe we can use the `file` output like you did here: http://git.overlays.gentoo.org/gitweb/?p=proj/portage.git;a=commit;h=9c01486fafb781204c52577fb8a61e5210b4706c
mmm, that commit i explicitly enabled support for kernel modules