After further investigation, I think the actual files of interest are the OriginPresets because it's in there that the available races are enumerated. For instance, Generic.lsx:


<?xml version="1.0" encoding="UTF-8" ?>
<save>
<header version="2" time="1387205254" />
<version major="1" minor="3" revision="0" build="0" />
<region id="CharacterCreationManager">
<node id="root">
<children>
<node id="OriginDesc">
<attribute id="OriginDisplayName" value="Custom" handle="he058b2afgcdf2g4c7ag939dga65bcfc0fad6" type="28" />
<attribute id="OriginName" value="Generic1" type="22" />
<attribute id="OriginDescription" value="Your past is history. All that matters is your present in Fort Joy. A Sourcerer in a land ravaged by Source, you await the cure promised by the Divine Order." handle="h5a614f15gea57g42d5gb7b0g29cff46fdf7c" type="28" />
<attribute id="OriginLongDescription" value="Very long descritpion goes here." handle="h032adcc1gd80cg4b81g8658g689437b36e4d" type="28" />
<attribute id="CharacterUUID" value="7b6c1f26-fe4e-40bd-a5d0-e6ff58cef4fe" type="22" />
<attribute id="UserCanAlterTags" value="1" type="19" />
<attribute id="SkillSet" value="Avatar_Generic" type="22" />

<children>
<node id="SupportedGenders">
<children>
<node id="Gender">
<attribute id="Gender" value="Female" type="23" />
</node>
<node id="Gender">
<attribute id="Gender" value="Male" type="23" />
</node>
</children>
</node>

<node id="SupportedRaces">
<children>
<node id="SupportedRaces">
<attribute id="Object" value="Human" type="22" />
</node>
<node id="SupportedRaces">
<attribute id="Object" value="Dwarf" type="22" />
</node>
<node id="SupportedRaces">
<attribute id="Object" value="Lizard" type="22" />
</node>
<node id="SupportedRaces">
<attribute id="Object" value="Elf" type="22" />
</node>
<node id="SupportedRaces">
<attribute id="Object" value="Undead_Human" type="22" />
</node>
<node id="SupportedRaces">
<attribute id="Object" value="Undead_Dwarf" type="22" />
</node>
<node id="SupportedRaces">
<attribute id="Object" value="Undead_Lizard" type="22" />
</node>
<node id="SupportedRaces">
<attribute id="Object" value="Undead_Elf" type="22" />
</node>
</children>
</node>
</children>
</node>
</children>
</node>
</region>
</save>


Unfortunately, I either don't know enough about how XML works or the game merges the shared and local mod versions in such a way that simply deleting the "SupportedRaces" nodes for undesired races does not remove them from character creation.


DOS2 Mods: Happily Emmie After and The Noisy Crypt

Steam Workshop
Nexus Mods