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Nice post! You might be interested in the specialisation option. See also this recent thread about it 
That looks really cool. It appears that it doesn’t show up correctly in the boot menu with systemd-boot though. I might poke at it a bit more as it would be a bit more convenient to build them both and just pick at boot.
You can also switch to a specialisation with
sudo /run/current-system/specialisation/foobar/bin/switch-to-configuration test