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If your JCW still has the original crank pulley you may be able to kill two birds with one stone. The original pulley has a limited life so you could upgrade to a 2% oversize dampened pulley and come very close to what you are looking for. Installation is also very easy.
Steve
Pretty much all your answers are here in your thread, simplest and best upgrades for a JCW car (without cracking into a head itself) are +2% Crank Pulley, Cam and Custom Tune.
That basically covers most if not all of your pre "Big HP" basics.