I was investigating if I could use a demo by using the commands linked at the top of
this thread to display commands (like +jump and +duck) on the console, but it appears to drop a lot of commands randomly. So that might work, but it would take a bit of luck or just retrying until it picks up all the important commands. Another thought I had is if there is a program that records keypresses with timestamps in the background, someone could use that. I don't know if anything like that exists.
As an aside this seems like quite a lot of work for something so basic. Do we, as a community, really not know thing? We know the exact height of a perfect ctap, but not the timing?