I use archiso and a number of custom PKGBUILD files to configure all my gear, boot into it as a live ISO and if I need additional packages I install them as I n

I use archiso and a number of custom PKGBUILD files to configure all my gear, boot into it as a live ISO and if I need additional packages I install them as I need in the live session (normally I keep an executable README.md that installs every thing I need in the package root) if there’s anything I want to keep config wise I merge it into the package that preps /etc/skel/ for the next build.