package Bogus;
use strict;
use X11::GUITest qw(SendKeys); # and whatever other functions


##</code><code>##

package MyBogus;
use Moose;
use MooseX::NonMoose;
extends 'Bogus';

around ...;

##</code><code>##

package X11::GUITest::Moosified;
use Moose;
use MooseX::NonMoose;
extends 'X11::GUITest';

around ['SendKeys'] => sub {
    ...
};