I don’t have time to read the thread, so i just answer the initial question:
- have a graphical installer where you can select your favorite DE or WM and basic settings (see RFC: Graphical installer for NixOS · Issue #21662 · NixOS/nixpkgs · GitHub)
- have a graphical editor for
configuration.nix
(i don’t know how that could look like. good research topic ;))
See User-friendly NixOS distro? - #34 by davidak for previous discussions…