The config file worked great. I did have to make a minor change to the command though:

exiftool -sep ", " '-keywords<EBV: ${Nikon:ExposureBracketValue}, EC: ${EC}' -overwrite_original -if '$Nikon:ShootingMode =~ "Exposure Bracketing"' *.nef

The other only wrote the EC value.

Thanks a bunch.

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Alyda