That is not only true for a perpetually-inertial observer and her helpers. It is also true for ANY inertial observer who is stationary with respect to those clocks. ANY different answer will contradict those direct measurements. I agree that it would be absurd to contend that. It seems to me, in light of the above requirement that he cannot "contradict those direct measurements," that he has to use the CMIF method. Any other answer will have him contradicting those direct measurements. I don't understand why you don't see that.