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modifying debian installer image




I have downloaded debian netinstaller:

wget
http://ftp.debian.org/debian/dists/stretch/main/installer-amd64/current/images/netboot/debian-installer/amd64/initrd.gz

I have unpacked the image, and I was looking around to try to understand
how it works. I assumed, there was some config file with a list of all
the packages that are going to be installed.

I would like to modify that list, and replace systemd with sysvinit-core.

I don't see any such package list in the installer, and I could not find
much information on how the installer works.

Could somebody please help me understand, where the installer gets the
list of packages it installs ? And how I can change that list?

PS: I know I can remove systemd and install sysvinit-core *after* the
installation. But I am trying to avoid installing systemd and then
removing it. I would like to install sysvinit-core right away.

I am also using preseeding for installation, but as far as I know, this
cannot be achieved with preseeding alone.

thanks,