the 16 would rather not fit a 197/200 not because of the brembo, but mostly because of the front suspension independent axis thing, I ve been talking to a rally driver who has a 197 "N GROUP" not an R3 and he has the standard independent axis front suspension and told me its in the way, who knows maybe a smaller offset would help it, but I dnot know, the R3's run 15" on gravel , 16" on snow, there is no 16" gravel tyres at all on the market, as even the WRC run 15" on gravel, same as the S2000 do, the S1600, the N4.... 16" wheel is for the winter studded tyres.....
let us know if you investigate it further and if it does somehow fit let us all informed!