I dont know the range of the forces involved in shifting. I will take a hardeness test on the oem drum and start from there and probably try one in 7075 T6. If it wear too fast, then too bad.
Cant be as strong a steel for that application, but if it can hold for sometimes, maybe some people would be interested to try one to save weight and chage it each season.
We will see, easy to cnc anyway, i'll make one in 4140 too.