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In the config folder of my mod, i have subfolders for the different mission types. The ones labeled "NFC" are what you are looking for, the variants on the Neutralize Fieldcommander mission.
I believe that through deleting (or better, blanking them) the XComMissionSources.ini in both the "NFC" and "NFC_var01" folders you should be able to remove those variants from the mission rotation.
This won't affect missions already on your hologlobe, anything already generated in your save is already past that.
And there the description has details on the changes as well.
Sorry about that!
I meant to say diverse aliens by force level, i'll try running both and see if it works