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The JCW are great but you pay a big premium for one from what I can see, and if you just wanted the performance it’s easy and relatively cheap to replicate. Off the top of my head it’s a reduced pulley on the supercharger, cooler plugs, a different intake system, higher capacity injectors, exhaust (not sure about manifold) and a different map. You could get a good chunk of the gains with a pulley/plugs/filter for a couple of hundred quid. Things get a bit more expensive when you start looking at the suspension/brakes element.
The good thing is there are quite a few R53’s around, I’d also check out the ‘R53 Owners Club’ group on FB as they have cars for sale. A lot will have had a few mods, which wouldn’t worry me, like a reduced pulley, exhaust and intake/filter but from my search there’s still a reasonable amount around that are standard. Good luck keep us posted 👍