You can't do jack sh*t with them. That's what is silly about the ss kit being a dealer fit aftermarket kit. Two boxes full of crap.
Okay, so you might use the wheels as spares, or with different tyres for road, track, or winter. And you might be able to sell some bits as spares to someone with a standard Abarth, but it is still all hassle.
If it was factory fitted it would be cheaper, probably about £16K and you wouldn't need parts fitting twice. So you might have to pay higher road tax, so what!