How about having SOME forbidden characters so that I can replace them with specific alternatives? I suppose I could do that before passing the result to the awk example you posted (making sure to include whatever my alternatives are in the list of allowed characters).
In your example, anything not defined in the substitution is replaced with "" correct?
So if I create another command and I omit the ^ which is a NOT if I recall, I can include a list of characters to be replaced.
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