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Hi Anthony,
The solution that you are proposing is possible and I think there is already something similar on the market. However, there are some limitations, such as f-stop which is calculated as the ratio of the entrance pupil and focal length and related mechanical vignetting which is related to the exit pupil position and aperture opening.
Another limitation can be related to the docus throw which is usually different (length and step) for different type of lenses.
Cheers,
Viktor