Only Using Openbox (vs GNOME/Openbox or KDE/Openbox); and xfce4-power-manager and polkit

Only Using Openbox (vs GNOME/Openbox or KDE/Openbox); and xfce4-power-manager and polkit

[Jaft via]

So I got Guix working on a laptop and've been playing around with the system config.
I've been trying to see how things work and figuring out what to use a service for and what to install a package for. I have part of my config. as so, currently:
(users (cons* (user-account                (name "name")                (comment "Full N. Ame")                (group "users")                (home-directory "/home/name")                (supplementary-groups                  '("wheel" "netdev" "audio" "video")))              %base-user-accounts))(packages  (append    (list (specification->package "openbox")          (specification->package "nss-certs")          bc dunst compton inxi-minimal htop lxterminal          lxappearance catfish thunar thunar-volman          xfce4-power-manager arandr tint2 rofi clipmenu          seahorse file-roller gnome-calculator          gnome-font-viewer gnome-screenshot          gnome-themes-standard papirus-icon-theme          font-abattis-cantarell font-fira-code ncdu          pulsemixer i3lock nitrogen viewnior)    %base-packages))(services (cons*            (service slim-service-type (slim-configuration                                         (display  ":0")                                         (vt      "vt7")))            (modify-services %desktop-services (delete gdm-service-type))))
One of the things I'd like to change is SLiM shows three types of Openbox to start; I'm assuming they all get setup as options with the Openbox package but I'd like to just use Openbox and GNOME/Openbox keeps showing up as the first option so I have to cycle twice to get the one I want every time I login.
Is there a means to remove the other two?
Secondly, trying to start xfce4-power-manager requires having to give a password; given it's a daemon, it feels like it almost should have a correlating service (outside of having to use an entire desktop environment service) but I wasn't able to find one.
Is there a way to start xfce4-power-manager on startup (even if it's just via Openbox's autostart) such that the user's password isn't involved? And, if so, is there a best means to do so within the context of running Guix?
Thanks for any help!
Jonathan