Use symlinks on the clients. Change the shebang line to the fixed location of the symlink (#!/usr/local/bin/my-shiny-perl in my example). Make the symlink point to the perl interpreter you want to use. It does not matter where the interpreter is installed (locally or on the NFS server).

$^O happens when perl is already running, so that's too late. You choose perl by the local symlink.

Of course, you can have some kind of installer script that actually creates the local symlink. Something like this (untested):

#!/usr/bin/env perl
# ^-- use any perl available
use strict;
use warnings;

my $shinyperl=($^O eq 'linux') ? '/nfs/linux/bin/perl' : '/nfs/aix/bin
+/perl';
symlink($shinyperl,'/usr/local/bin/my-shiny-perl') or die "Create syml
+ink failed: $!";
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Alexander