Well... popped my bubble... Zorin OS Desktop Lite is still in build process for 20.04. So much for the easy way...
welp.
sudo add-apt-repository ppa:zorinos/stable
sudo apt update
sudo apt install xfce4
sudo apt-get install xfce4-goodies xfce4-zorinmenulite-plugin plymouth-theme-zorin-logo zorin-appearance-layouts-xfce-core zorin-desktop-themes zorin-icon-themes zorin-os-fonts zorin-desktop-session
If all completes successfully, log out, then log in on xfce session.
From there you can:
sudo apt remove --purge lubuntu-desktop
to reduce space taken up.
You can open Settings and change the style and icons to the Zorin Theme and Icon theme of your choosing. From settings, open Window Manager to choose a Zorin border theme for the windows.

