I’m looking for a distribution on which I could use dwl so distributions that come with some kind of DE or WM out of the box are out.
Ideally, I would like to dodge systemd, but if there is no other choice, then I will accept it.
Seems like Gentoo or Void are your best options. Keep in mind that you will have to harden it yourself. Things like SELinux or AppArmor are left entirely up to the end user. Maintenance is also harder compared to more ‘standard’ distros.
Why not systemd by the way? If you didn’t mind it you could just use arch. I bet there’s probably even an AUR package for dwl.