Check out the AppStore review guidelines Apple recently published.
2.20 Spam developers in the App Store with many versions of such applications will be removed from the iOS developers program
In addition, I think it would be wise to advise your client against such a move, as this will only lead to fragmentation for the application. Applications have keywords, so perhaps you should focus there to increase your search results. I think that you have problems sending the same application to the store under different developer accounts, not to mention that you have separate developer accounts to even try to submit such materials. In fact, it will be a headache.
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