Is there any chance you could add a way to unlock all recipes (both default recipes and those added by your mod)? I've been trying myself but I'm not having much luck. Adding a book that does so wouldbe one way, and I've tried myself but I can't figure out how to add or change the results of using a book in the editor.
The other way would a script but I'm not exactly certain how to write it.
You can assign it via use actions on items. Select recipe book and recipes you want to assign to an item/book.