All you need to do that is a precision measuring device like I have and access to every type of shifter made for more than 20 years and lots of time. My measurements of Campy 10 and 11 shifters, made many years ago were as accurate as I could do with a precision rule, but repeating the same test with a much more accurate measuring device showed some small errors.

The OP had preconceptions of the expected results and set out to prove them. I did my tests with no idea of what the results would be and made many repeated runs through all shifts and took the average of all runs.

There are many lists of shifter cable pulls out there, but most are probably not very accurate and many only list the average cable pull. The average means little.

I can remember claims of some SRAM shifters that supposedly had the same 3mm cable pull for all shifts, working with some Campy drivetrain. By my tests, the RD position would be off by a full cog after only 4 shifts. There's just very little reliable info info out there. A company like j-tek probably knows more than anybody.

I know how to make a Campy 10 RD or 2015+ RD work with pre-2015 campy 11 levers.