A new engine too, the Adour 951. RR have worked wonders developing the Adour over the last 50 years and I have always wondered if it was feasible to redesign the Hawk to take an AB version of the Adour such as the now retired Mk106. Fanciful perhaps but just imagine what a sprightly performer it would be with 50% more thrust combined with that new wing.
If nothing else the quality of the original design still shines through.