Personally, having been recommended it elsewhere, I'd use the Strawberry perl distribution since it satisfies all our requirements e.g. Win2K3 server, self-contained make (dmake) and compiler (gcc).
Just download the distro, get it across the air gap and run the install - the only drawback, if you can call it that, is the installation directory - which is C:\\StrawberryPerl.

After that, download any modules not present in the distro, get them across the air gap, unzip and run the standard/recomended build, test & install seqeunce ...