SQL Loader with decimal commas

Dear All,
I am loading data for a German client and the delivered files contain numeric data with decimal commas. For example 123,5 instead of 123.5
I've been googling like mad on this one and there is a lot of chatter about setting NLS_LANG and/or NLS_NUMERIC_CHARACTERS but none of this seems to work in the SQL Loader environment.
I imagine that I will end up cobbling together a complicated thing with TO_NUMBER or with another function but I really can't believe that SQL Loader doesn't have a simple switch to flip from point to comma.
Or have I overlooked something?
Any tips would be a great help.
Regards,
Alan Searle

I am on a client's PC and don't have access to administrative settings.
And also, I cannot be sure that whoever runs the load function in the future will check this.
It is therefore important that I find a way to set this in SQL Loader without any other dependencies.
I think I will probably end up processing it as a string and then translating it to numeric. But this seems like a sledge hammer to crack a nut.
Regards and thanks,
Alan

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