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This post details what the d-i team currently shows as the only way.
It has several shortcomings and one missing documentation part.
Shortcoming: --purge is missing from the apt-get invocation. This leaves packages in “rc” state (requiring a manual dpkg --purge to completely remove them later, as they are then invisible to apt).
Worse shortcoming: this still leaves all dependencies pulled in by systemd around on the system, because packages installed by debootstrap are not eligible for “apt-get --purge autoremove”. Additionally, it does not influence debootstrap’s (nōn-existent, see #557322, #668001, #768062) dependency resolver, leading to possibly pessimistic package selections.
Missing: you can just hit Alt-F2 and enter the command…
in-target apt-get --purge -y install sysvinit-core
… there, no need to preseed. But this does not eliminate the aforementioned shortcomings, of course.