I went with steel brakes because I plan to eventually track the CS when my 1M is ready to retire (I believe it is still in its adolescence). I also got DCT so my left foot can retire with the 1M.
I would still be curious about the answer to the OP's question . . . does a rotor and pad swap (EASY) work, or would the calipers (MESSY PAIN IN THE ASS) need to be changed also? Anyone know?
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1M track toy mods: BMS chargepipe, BMS OCC, ADE FMIC, ADE motor mounts, MadDad/Lightweight Ti exhaust, ADE custom oil thermostat/cooler, custom MHD tune, F10 550i clutch, Ohlins R+T, Vorschlag camber plates, M3 'vert FSB with Turner endlinks, Stoptech Trophy BBK.