The addition of this startup scripts will have no consequence in binary, as they are not included (yet). The systemd version could be added to the Debian package in a future version. EDIT: I modified the build_deb script to add the systemd version in package.
Note that I tested the openrc version, but not the systemd one, as I do not have a systemd environment here. Anyway, I hardly modified a file already used by some Ğ1 users, so it should be correct. EDIT: Systemd script is now tested.
If this MR could be included in future v6, the startup scripts will be used by the Gentoo package to automatically add the service.