Your description says you are looking for a way to just merge your mod without requiring replacement of the entire embedded 'DefaultGameCore.ini'. Since these are INT file changes, you might want to look at 'Custom Mod Builder and Manager' by FMod. It handles that for INIs and INTs (only). There are some examples in it's 'Mods' folder (any of the Rank Name change mods for instance) as well as the 'INT' folder which holds the resulting modified 'XComStrategyGame' files. The comments thread also has some Q&A on the INT modding process.
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-Dubious-