That depends mostly on the sensors and other systems fitted as to how expensive the CCA is. IIRC, well over 40% of the cost of the F35 is all the sensors and systems. Cut the systems down to a single IRST/EOTS and no radar or DAS, you get a much cheaper aircraft even if it does used the same engine and skin materials as an F35.
Go down to LO shaping with minimal RAM usage and you save more money. Since most of the RCS is determined by external shape, you get a lot more leverage from shaping than from RAM.