Ah, that's a good solution then
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That goes for CM's in general though. By that logic, no one should be able to wear the gear, because you can't prove they weren't carried.
For me, the concern is mostly about characters that I haven't even started yet, or that are low level. Next expansion I might start a Draenei Priest and find that some of the CM gear
really exactly fits her, and would be my favorite transmog set for her. And I
do have completed the CM's on my Night Elf Priest. I guess I just don't see why my newly created character, with whom I couldn't possibly have done CM's since she was created after MoP, can't have access to the gear I earned on another character of the same class.