Updated to Version 2.
Now able to filter COMBINATIONS of flags.
Example pics still got you covered.

Originally found here: https://www.nexusmods.com/skyrimspecialedition/mods/16011

This edit contains a much needed reference table of values and explanation on how to use them.

This script will ADD KEYWORDS as well as change body slots.
Only use this if you must add keywords too, otherwise you'll probably just add a whole bunch of null references.
Someone please let me know if this one works like you hope, or not!