Depending on your needs, one option would be to consider Strawberry Perl's portable Perl, which does not actually "install" anything. Instead, you run a batch file that sets up the environment variables for a new command prompt so that inside that command prompt it will use the portable Strawberry Perl.

This would allow you to have multiple versions of Perl on your system. Of course, the draw back is that if you want to use a certain module with each version of Perl, you would need to install that module multiple times.