This should do it, you'll need the includes folder (has moon.xml in it to determine moon phases), which is why I've zipped it.
Just unzip the contents and put them in your Windower/Plugins/Spellcast folder, rename the blm_medal_obi_pants.xml to Lordjecht_BLM (or whatever you prefer) and you should be good to go after loading it.
I'm not ingame atm, so I can't double check it to make sure it works, but there shouldn't be any issues. Make sure you open it to edit variables to match if you have Obi's/Pants/U Pedant. Use "1" if you have it, "0" if you don't~
EDIT: Just re-read your post and realised I included Obi's in that Spellcast file. The easiest way to make it ignore them is to set all of the "Obi" variables to 0. Like so:
<var name="DarkObi">0</var>
<var name="LightObi">0</var>
<var name="ThunderObi">0</var>
<var name="IceObi">0</var>
<var name="FireObi">0</var>
<var name="WindObi">0</var>
<var name="WaterObi">0</var>
<var name="EarthObi">0</var>