There's a closed pull request on the void-packages repository

New package: 66-boot-0.1.2.1
https://github.com/void-linux/void-packages/pull/21142

Description:
66-boot packages obarun's boot-66serv, which, as its author puts it, is a portable set of 66 services that can boot unix machines successfully. The packaging just helps with transitioning from runit to s6/66. The package in itself does not replace any of /bin/init, /bin/reboot, /bin/poweroff, etc... It merely installs another shell script that servces as init at /bin/66-bootstart which can be used with an alternative init=/bin/66-bootstart kernel command line argument. The user is left with the responsability to organize its machine as he sees fit and should find the shutdown, reboot and halt scripts in the /etc/66/ directory. Symbolic links to those scripts could be added to the package's INSTALL.
66-boot doesn't offer any service frontend files either (with the exception of tty@ which is necessary and the boot bundle directory which 66-boot's init binary (which is called by the 66-bootstart script) uses.
Another package named 66-services should package a compilation of possible 66 frontend service files for most daemons, as it seems rather difficult to put each daemon's frontend file in its corresponding package.