I can see the logic in what you're saying and I'll not rule it out, but I'm not sure I'm buying it. The camera can definitely "see" the lens, and will set and use whatever aperture I want, it just won't save an f stop number to the Custom Setting.
I'll try it tomorrow with a Canon lens, although I only have an 18-55 kit lens and a 100-400L, (both fairly old).
I'll also have a look around for a dedicated Canon Forum, (or it might have to be a Facebook page, as that seems to be more popular than the forum format now).
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