Have you tried what happens? I think I mentioned this elsewhere, but, the issues with non-one-to-one ToC to files with kepubs is a lot less than it has been. And hasn't been for a while. I still generally recommend it, but, I also have plenty of books where it isn't the case and cannot think of any actual issues when reading them.
Your best bet is to try it and decided if the issues are a problem for you.
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