I don't think you can do what you want. You would either have to replace all the letters in the book with the letters that the dictionary recognises, or you would have to add new entries to the dictionary for every word that might be spelled with special characters. Since you don't want to do the former, typing in the words manually to look them up is easier and faster than doing the latter.
If it's possible to use NickelMenu to perform dictionary lookups, you could potentially inject a shell script that would find and replace special characters before passing the word to the dictionary, but I don't know of a way to perform dictionary lookups with a shell script on Kobo.
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