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Can I restore keyboard input that was made during Mac OS startup?

I wonder if it is possible to find out which keys the user pressed during the launch of his Mac OS?

Anyway. As far as I understand, there is no easy way to just connect the application / script to start working and capture keystrokes simultaneously with the OS. But maybe there is a way to turn this into a reverse engineer? Maybe searching for a specific log file or something like that?

All results will be completed. I am mainly interested in the search that the user pressed / held during the OS startup. It can be a string, a character code or a hexadecimal code, it does not matter.

UPDATE: Guided by the recommendations of Pekka. I found a kernel extension that should do the job. And this, I hope, will do it after this next question - Why does this keyboard intercepting the kernel extension not work? . :)

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I am not an OS guru, but I think very, very, very hard. I do not think that such things are automatically recorded anywhere.

I think you will need to see how the part of the system that processes the startup keys is somehow accessible and can be expanded to invoke the command you define.

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