In that case, create a new account, register your reader to it, redeem the code, spend it, read the book you want to read. Then authorize it to your wife's account. It will deauthorize it from yours. Then if you ever want to reread what you bought, authorize it back to your account. All the books purchased from her account won't work. But when you switch back, they will again.
Question, how many ebooks does your wife have from her account? If she doesn't have many books and she doesn't care about rereading them again, you can just blow off her account once she finishes her books and just use yours.
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