I did almost the same, but I am converting things as slowly/lazily as possible. One thing that helped me tremendously migrating the configuration bits was to l

I did almost the same, but I am converting things as slowly/lazily as possible. One thing that helped me tremendously migrating the configuration bits was to leave "scratchpads" that I could tweak quickly without a full rebuild cycle: programs.kitty.extraConfig = '' include ${config.xdg.configHome}/kitty/temporary.conf ''; Then my ~/.config/kitty looks like this: ~/.config/kitty $> ls 87 Dec 13 11:39 kitty.conf -> /nix/store/....-home-manager-files/.config/kitty/kitty.conf 381 Dec 13 11:42 temporary.conf