If you open that file with normal notepad (RMB -> open with), you can see which entries are added/deleted/altered and where they are located. You can, with this knowledge, edit your Coalesced file manually with Notepad++.
It should be noted that editing the coalesced.ini will likely lead to the game crashing at startup, because the file is actually checked for editing with some kind of integrated checksum based on file size. Use https://www.nexusmods.com/masseffect2/mods/116/ to fix.
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Use https://www.nexusmods.com/masseffect2/mods/116/ to fix.