I like that idea. It might break things, but at this point, ANY new simple reactions will, so maybe we just need to give up and start breaking old stuff.
So right now the reaction is BREL + LAVA(CLST) -> LAVA(CRMC) (as long as the temperature of the molten CLST is 50 more than what the CRMC melting point would be at that temperature)
I guess having it formed with PQRT or molten PQRT makes a little more sense than BREL.