Looks like RB is in full production on street and race pads for our cars, as well as replacement iron ring rotors. Even seems they have CCB setups for cars with existing CCBs needing replacement, and iron rotor conversions (with pads too).
I've been talking with Warren over at RB and might be trying out on of their more aggressive street/track hybrid compounds (ST600). What's interesting is that they were designed originally for CCBs but apparently also work nicely on iron rotors. If I give them a try I'll report back here.
Some links to the products pages for the benefit of others:
iron page:
https://racingbrake.com/f90-2018/
CCB page:
https://racingbrake.com/f90-2018-1/