Imo upgrading the brakes on a 924S shouldn’t be a priority for an occasional track car, stock brakes are plently good, personally I would spend the money on suspension and tires instead. However if you still want to fit 4-pot Brembos from the S2/turbo you don’t have to change your suspension to late offset, I think you just need rotors and calipers from an 86 turbo.

The only advantage of late offset would be the stronger hubs and easier rotor removal, but I’m not sure you would find Porsche wheels to fit easily and they would probably need to be a custom offset from an aftermarket supplier.

Again, I repeat I’m not too familiar with the 924S, probably should start your own new thread on the 924/944 forum where someone else can chirp in.