FYI, since we're running benckmarks:

#!/usr/bin/perl
use warnings;
use strict;
use Benchmark 'cmpthese';
use Sort::Naturally 'nsort';
use Sort::Key::Natural 'natsort';

my @data = grep /\S/, <DATA>;

sub normalize_digits {
    my ( $key ) = @_;
    $key =~ s/(\d+)/sprintf '%03d', $1/eg;
    return $key;
    }

cmpthese -10, {
    SN_nsort    => sub { my @s = nsort   @data },
    SKN_natsort => sub { my @s = natsort @data },
    GRT_pack    => sub { my @s =
        map unpack( 'x3 a*', $_ ),
        sort
        map pack( 'n a a*', /(\d+)([A-Z])/, $_ ),
        @data
        },
    ST_sub      => sub { my @s =
        map  { $_->[ 0 ] }
        sort { $a->[ 1 ] cmp $b->[ 1 ] }
        map  { [ $_, normalize_digits( $_ ) ] }
        @data
        },
    GRT_sub     => sub { my @s =
        map { local $_ = $_; s/^.*\0//; $_ }
        sort
        map { normalize_digits( $_ ) . "\0$_" }
        @data
        },
    GRT_sprintf => sub { my @s =
        map { s/-0+/-/g; $_ }
        sort
        map { s/(\d+)/sprintf '%03d', $1/eg; $_ }
        @data
        },
    };

__DATA__

K-2-D-10A
K-2-D-10C
K-2-D-10D
K-2-D-10E
K-2-D-10F
K-2-D-10G
K-2-D-11A
etc.
etc.
[download]

Which gave me these results:

              Rate SN_nsort SKN_natsort    ST_sub   GRT_sub GRT_sprint
+f GRT_pack
SN_nsort    64.6/s       --        -81%      -90%      -91%        -93
+%     -97%
SKN_natsort  341/s     427%          --      -47%      -51%        -62
+%     -82%
ST_sub       642/s     893%         88%        --       -7%        -29
+%     -67%
GRT_sub      694/s     973%        104%        8%        --        -23
+%     -64%
GRT_sprintf  900/s    1292%        164%       40%       30%          -
+-     -53%
GRT_pack    1928/s    2883%        466%      200%      178%        114
+%       --
[download]

:-)

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