check out nosh. It explicitly states systemd compat as one of its
goals and goes to great lenghts to make it happen.
It preserves the daemontools style and spirit.
Meanwhile, while hordes of programmers are busy making everything fit
into the systemd-world (and fixing bugs they've created in the process),
a bunch of hackers behind Void Linux made everything tick on top of
runit without all that much effort.