If no one else is going to shout "here!", I'd raise my hand.
I've done quite a bit of low level hacking in PDF (as well as its
cousin PostScript), so this might be a good fit... (Actually, I've
written my own PDF lib in Perl (that was before PDF::API2 was ready for
prime time) -- unfortunately, it's proprietary... (paid work)).
Also, I have access to virtually all major unix platforms, so I could
at least make sure the modules build/work on those.
OTOH, I'm entirely new to maintaining CPAN modules... so I'm
wondering, what does it entail beyond hacking at the sources?