Unless I'm misunderstanding your goal, I don't see any reason why you can't use Module::Load or Module::Load::Conditional or a combination of both. Here's a simple test script which works for me.

#!/usr/bin/perl

use strict;
use warnings;
use Module::Load;

my $os = 'Yet Unknown';

if ( $^O =~ /MSWin/ ) {
    load 'Win32';
    $os = Win32::GetOSName();
}

print $os;
[download]

Output of my test: D:\perl>test.pl
Win7

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