You need to apply 2 patches one in rusty-rain and another in ezemoji. In the main post I linked a PR for the ezemoji patch, you need that branch as dependency. Also there, I pasted another patch to be used on rusty-rain that uses your modified, local version of ezemoji, and a extra flag to choose FOSS icons. I’ll update instructions on the PR.
It’s Hyprland, also I’m using waybar and tmux.