Once again the usual rules apply if you do not have the vin number of the GTS or indeed the CRT you will not get access to purchase the exclusive accessories for these cars.
You might say that this is a work in progress... There is of course plenty more that can be added but usual marketing applies that it cannot be too exclusive or else no one would buy it.
Of course we are thinking about it for further cars - Such lightweight solutions are being tested on the new M5 cars that are still disguised as an M car prototype always has something else going on which you cannot see.
But this is at the cusp of the programme - CFRP is becoming more cost effective and more available since BMW have built their own facility to mass produce it. So we are at the early stages of what is possible now and a taster to show what can happen in the near future.
In regards to stripped out M3's in North America?
Whilst some might crave the idea of such a car? You are in a minority and unfortunately that minority would not support the costs of federalisation as US BMW customers see the M3 as a Performance luxury vehicle. And no one will give up their luxuries such as power seats etc for such a more lightweight concept.
One such piece of evidence is how over the years a majority of US M3 customers have forgone the CFRP roof for the sunroof option.