As another poster suggested, you should probably maintain your own Perl build (just beware AIX' broken toolchain). Since CPAN modules are no longer tested on AIX, as far as I can tell, a private build would also give you a little hedge against unexpected module upgrade breakage.

Finally, I wish IBM would bring AIX into the 21st century (or put a bullet in it and be done with it). Doesn't it bother anyone at IBM that CPAN modules aren't being tested on AIX, or that the software tools have feature sets from the 1990s and that the only way to get a decent toolset is to install the GNU/Linux utils?