There already is an experimental image based on Silverblue with the alpha stage Cosmic Epoch Desktop.
Mainly finetuning and SELinux profiles are needed!
Join the Matrix Group! (yes, no Discord 😉)
I have honestly been tempted to hop to Pop!_OS for their take on GNOME. The auto-tiling was really nice when I tested it in a virtual machine.
Pop Shell can actually be used on other distros. Here’s how: https://support.system76.com/articles/pop-shell/