Homemade 6 pack metering plates...

Has anyone ever tried or considered taking a set of Holley 6 pack outboard metered plates and tapping them for use of the Holley jets, creating your own adjustable metering plates? Forgive me if this is common or has been done, I searched and did not find anything. I have never seen a set of Promax or other plates up close so I do not know the difference and my knowledge of Carbs and 6 packs is minimal. I am looking to get a set for my car, but have a handful of Holley plates and was wondering if I could just tap them for the jets. Thanks in advance all.
See the two small holes at the bottom edge of the plate (near the numbers)? Those are the jet orifices. There is no way to drill and tap those for jets. There is no room.
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