I don't have solutions for you; i want to also keep my KDE settings saved. But I'm full on nixos and home manager so I'm going plasma manager route.
Technically you could use plasma-manager on any distro; you install nix, and use home-manager standalone. I think with KDE; you would want to skip package management, but doable; I used to do with arch.
I guess depends on what you already use for configuration management. Bear in mind; a lot of KDE apps do store state information (window size etc.) inside the config directory and there wasn't an easy way to disentangle config from state when I used to manage my config with a git repo.
Technically you could use plasma-manager on any distro; you install nix, and use home-manager standalone. I think with KDE; you would want to skip package management, but doable; I used to do with arch.
I guess depends on what you already use for configuration management. Bear in mind; a lot of KDE apps do store state information (window size etc.) inside the config directory and there wasn't an easy way to disentangle config from state when I used to manage my config with a git repo.