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Respray would defo be the cheapest option rather than retrofitting the 172 components to a Cup. However, the retrofitting option wont devalue your car like a respray certainly would as you could argue that the extras are standard options in a way...
I think youve got to ask what youd actually gain by doing so though! Had you owned a cup i could see why youd want some of the 172 bits like ABS as that could improve performance but resraying your 172 isnt doing anything other than putting a big dent in your wallet...