The only aftermarket alloys I have come across have been from Rimstock IIRC.
https://www.rimstock.com/Shooter had a set for his Yellow/MattBlack Series 4.
Alex of Purple Supersport fame has also had some.
I don't think either set were without some challenges.
The S2 had a variety of multi-spoke but these were not so common.
The 18's + sidewall on the S2 definitely have a more even blend of comfort, grip and handling than the 19's on the Coupe.
