Somewhat like sibling comment, I'd be really tempted to put /home on its own filesystem, control/configure everything else with Ansible (or Chef or Puppet or [...]), and just do a fresh install every 6 months. For bonus points, automate the install part with an autoinstall file. Keep in mind, there's setup cost here; it's easy for me to say because I'm already controlling my system with Ansible, but if you're just getting started it's harder.