Hi!
I made a proof of concept (but working) XFCE variant of Fedora Silverblue (https://docs.teamsilverblue.org/).
Beware, this has been tested only inside a virtual machine for now.
The full details are here: https://discussion.fedoraproject.org/t/kinoite-a-kde-version-of-fedora-silve...
Use the following instructions to try it out on an already installed Fedora Silverblue system:
$ curl -O https://tim.siosm.fr/downloads/siosm_gpg.pub $ sudo ostree remote add kinoite https://siosm.fr/kinoite/ --gpg-import siosm_gpg.pub $ sudo ostree admin pin 0 $ sudo rpm-ostree rebase kinoite:fedora/28/x86_64/fedora-xfce
Hope you like it!