Usually, I use nnbsp (fines insécables) because I use embedded fonts and later convert to six-inch PDF. I find them smarter. So I tend to convert most of nbsp to fines.
Of course, some nbsp equivalents are left, namely after "tirets de dialogue".
You'll find lower down the group of regex in .json format that I use with the Calibre editor. You can import all of them and execute them as a group. If you have any question, let me know.
The construction of each regex is very basic.
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