I would first take a snapshot-bundle with the CPAN-module of my Perl-modules and then re-install basic Perl at the other location. Then I would use the CPAN module again to recreate my previous Perl-tree.

On the other hand, except for the basic Perl-install, I don't think the dll's in the "Perl/lib/site"-modules mind being moved around as they are dynamically called by Perl itself and do not seem to mind being moved around.

Of course some configuration files (CPAN::config.pm springs to mind) may need to have their paths adjusted.

Of course you could always write a Perl script to adjust the paths! (this is left as an excercise for the interested reader)